In this article, underwear refers mainly to everyday briefs, knickers and similar close-to-body garments. Bras and sports bras have additional structural considerations, while period underwear contains absorbent and leak-resistant layers that require a separate process. That process is explained in How to wash period underwear.
Underwear should normally be washed after every wear. A hygienic washing routine should remove body soils, use conditions that are appropriate for the complete garment and leave the item thoroughly rinsed and fully dry before it is worn again.
This does not mean that everyday underwear must always be disinfected, washed separately or placed on the hottest available programme.
A hygienic result depends on the complete washing process, including:
- how the underwear is sorted;
- whether visible stains are pretreated;
- the detergent and dose;
- the washing temperature;
- the programme and mechanical action;
- rinsing;
- drying;
- and how the clean garment is handled afterwards.
The care label remains the boundary for every step.
Hygienic washing is not the same as sterilisation
For ordinary household use, washing underwear hygienically means cleaning it to a level appropriate for normal rewear.
It does not mean that the garment has been:
- sterilised;
- made completely free from microorganisms;
- disinfected to a medical standard;
- or treated with the highest possible temperature.
Laundry hygiene results from several interacting processes. Detergent helps release soils and microorganisms from textile fibres, mechanical action moves the washing solution through the garment, temperature affects cleaning and microbial inactivation, and rinsing and drying contribute to the final result.⁴
No single setting determines the outcome on its own.
A hot wash cannot compensate for unsuitable detergent, an overloaded machine or inadequate drying. Equally, placing underwear in a separate load does not automatically make the result more hygienic.
The goal is to choose a complete process that is suitable for both the level of soiling and the garment itself.
Start with the care label
Before washing underwear, read the care label on the complete garment.
Everyday underwear may contain:
- cotton;
- modal or viscose;
- polyamide or polyester;
- elastane;
- lace or mesh;
- elastic waistbands;
- printed details;
- bonded seams;
- decorative trims;
- or absorbent panels.
The material named first on the fibre label does not determine the washing process on its own.
A predominantly cotton brief may still contain an elastane waistband, heat-sensitive lace or bonded components that set a lower washing limit for the complete garment.
Under the international textile care-labelling system:
- the number inside the washtub is the maximum permitted washing temperature;
- a line beneath the washtub indicates a mild process;
- two lines indicate a very mild process;
- a hand symbol requires hand washing;
- and a crossed washtub means that domestic washing is not permitted.¹
The maximum temperature is a boundary, not a temperature that must be used every time.
For a complete explanation of the symbols, see What do the symbols on lingerie care labels mean?
Wash underwear after every wear
Everyday underwear should normally be washed after each period of wear.
A worn pair may contain:
- perspiration;
- skin oils;
- discharge;
- traces of urine;
- fibres and skin cells;
- skincare products;
- and other ordinary residues from close-to-body use.
“After every wear” does not depend on whether the garment has been worn for a full calendar day. If underwear has become damp after exercise, hot weather or heavy perspiration, it should be changed and placed in the laundry.
The garment should not be worn again before it has been washed and fully dried.
The wider distinction between underwear, everyday bras and sports bras is explained in How often should bras and underwear be washed?
Sort underwear by compatible washing conditions
Underwear does not always require a completely separate wash load.
It can be washed with other garments when all items in the load have compatible:
- colours;
- care labels;
- temperatures;
- programme requirements;
- fabric weights;
- levels of soiling;
- and hygiene needs.
Before washing, separate:
- whites from dark or strongly coloured items;
- delicate underwear from heavy or rough fabrics;
- lightly soiled items from substantially more soiled laundry;
- hand-wash garments from machine-washable items;
- and garments requiring different temperatures or programmes.
New, dark and highly saturated colours deserve additional caution because they may release dye during early washes.
Avoid placing fine or elasticated underwear in a load containing:
- heavy denim;
- coarse workwear;
- rough towels;
- exposed zips;
- sharp fastenings;
- or rigid decorative hardware.
These items may increase friction, snagging or compression even when their colours are compatible.
The complete sorting decision is covered in Should bras and underwear be washed separately from other clothes?
Check for visible stains before washing
Inspect underwear before placing it in the machine or wash basin.
A normal wash may remove ordinary body soil, but a visible or dried stain may require treatment before the main cycle.
Treating a stain early can reduce the need to repeat the complete wash or use a more intensive process later. General laundry guidance recommends sorting first and applying an appropriate stain treatment before washing.²
When pretreating:
- identify the type of stain where possible;
- check the care label;
- confirm that the treatment is compatible with the colour and material;
- follow the stain-remover or detergent instructions;
- apply the product only where needed;
- and avoid aggressive scrubbing.
Rubbing a fine knit, lace panel or elastic edge can spread the stain or damage the structure of the fabric.
Blood and menstrual stains require their own treatment logic and should not automatically be exposed to hot water during initial treatment. The complete process is covered separately in How to remove period blood stains from underwear.
Do not apply bleach simply because the garment is underwear. Bleaching products should only be used when the care label permits them and the product is suitable for the colour and material.
Choose a detergent that suits the complete garment
Use a laundry detergent that is compatible with the underwear’s materials, colour and care instructions.
The best choice may differ between:
- durable cotton briefs;
- coloured synthetic underwear;
- lace-trimmed garments;
- items containing a high proportion of elastane;
- and highly delicate materials.
The detergent should be capable of removing the type of soil present without requiring treatment that exceeds the care label.
A normal laundry detergent is sufficient for many everyday garments. A product marketed as antibacterial or disinfecting is not automatically necessary for routine household underwear.
Similarly, a product described as delicate is not automatically suitable for every material. Enzymes, bleaching ingredients, fragrance and other components may matter depending on the individual garment and the wearer’s needs.
The wider detergent-selection framework is covered in What detergent is best for lingerie?
Use the correct amount of detergent
More detergent does not automatically produce cleaner or more hygienic underwear.
The appropriate dose depends on factors such as:
- the detergent formulation;
- the size of the load;
- the degree of soiling;
- the washing-machine design;
- and local water hardness.
Follow the dosing instructions on the detergent packaging and the washing-machine guidance.
Using too little detergent may leave soils insufficiently removed. Using too much may make rinsing more difficult and can leave detergent or suspended soil in the load. The American Cleaning Institute advises that both underdosing and overdosing can produce less satisfactory cleaning than using the appropriate amount.³
Do not increase the dose merely because underwear is included in the load.
If underwear repeatedly feels coated, stiff or strongly perfumed after washing, review:
- the detergent dose;
- the load size;
- the selected programme;
- and whether the machine is rinsing correctly.
Select the temperature and programme together
The washing temperature should not be chosen in isolation.
A hygienic washing decision should consider:
- the maximum temperature on the care label;
- the garment’s fibres and construction;
- the amount and type of soil;
- the detergent;
- the programme duration;
- the level of mechanical action;
- the size of the load;
- and whether an ordinary or special hygiene situation is involved.
A higher temperature may increase treatment intensity, but it may also affect:
- colour;
- elastane;
- lace;
- printed details;
- elastic waistbands;
- bonded seams;
- and other heat-sensitive components.
A lower-temperature programme may protect the garment, but the temperature alone does not demonstrate that every required hygiene result has been achieved.
The selected programme must also respect any line beneath the washtub symbol. A mild or very mild instruction concerns the level of mechanical treatment—not just the temperature.¹
The wider decision is covered in What temperature should underwear be washed at?
How to machine wash underwear
When the care label permits machine washing:
- Inspect the garment.
Check for stains, loose seams, damaged elastic, detached trims or colour-transfer risk. - Sort the load.
Group the underwear with garments that have compatible colours, care instructions, fabric weights and soil levels. - Pretreat visible stains.
Use a compatible product and avoid rubbing delicate areas aggressively. - Protect delicate items where appropriate.
A correctly sized mesh laundry bag may reduce snagging and tangling for lace-trimmed or highly elasticated underwear. It does not change the temperature, detergent or programme used for the load. - Do not overload the machine.
Garments need sufficient room for water and detergent solution to circulate through the load. Overloading can reduce cleaning and rinsing performance. - Add the correct detergent dose.
Follow the product instructions rather than estimating according to the fact that the load contains underwear. - Select a label-compatible programme.
Stay within the stated maximum temperature and use a mild or very mild process where required. - Use only permitted laundry additives.
Check the bleaching symbol and product instructions before using bleach, stain removers, disinfecting additives or fabric softener. - Start the wash without unnecessary delay.
Do not leave damp or heavily soiled underwear compressed in the machine for an extended period before the cycle begins. - Remove the load promptly.
Take the underwear out when the programme ends and begin the correct drying process.
A machine wash is not hygienic merely because the programme name contains words such as:
- Hygiene;
- Intensive;
- Cotton;
- Allergy;
- or Sanitary.
The actual programme conditions and the garment’s care label must still be assessed.
How to hand wash underwear
Hand washing may be required for delicate materials or garments whose care labels do not permit machine washing.
It should not be assumed to be automatically more hygienic than machine washing. Its main advantage is greater control over mechanical handling.
When hand washing is permitted:
- Clean the basin.
Use a clean container large enough for the garments to move without being tightly compressed. - Check the permitted water temperature.
Stay within the care-label limit. - Distribute the detergent in the water.
Use the recommended amount and ensure it is dissolved or evenly dispersed before adding the garment. - Add a small, compatible load.
Do not crowd the basin with several garments that require different colours or care conditions. - Allow the underwear to become fully wet.
Move it gently through the washing solution. - Apply controlled mechanical action.
Lightly press the solution through the fabric. Do not scrub lace, pull elastic or rub the garment vigorously against itself. - Drain the used washing solution.
Do not leave the underwear soaking indefinitely unless the garment and product instructions specifically permit it. - Rinse thoroughly.
Replace the water as required and continue rinsing until the detergent has been removed. - Press out water without wringing.
Support the complete garment rather than stretching the waistband or leg openings. - Begin drying promptly.
Reshape the underwear where necessary and follow the drying symbol.
GINETEX advises that hand-washed textiles should be moved carefully in the washing solution, rinsed well and pressed rather than rubbed, pulled or wrung.¹
Hand washing should reduce uncontrolled mechanical stress. It should not replace machine movement with aggressive manual scrubbing.
Rinse the underwear thoroughly
Rinsing removes:
- loosened soil;
- detergent;
- suspended residues;
- and products used during pretreatment.
A garment that still contains a large amount of detergent after washing has not completed the full cleaning process.
When machine washing, select a programme that provides appropriate rinsing for the detergent dose and load size. An additional rinse may be useful in some circumstances, but it should not be used as a routine substitute for correct dosing and loading.
When hand washing, replace the water as needed and move the garment gently rather than repeatedly squeezing or twisting it.
Do not try to judge cleanliness only by fragrance.
A strong perfume does not demonstrate that body soils have been removed, while a low-fragrance or fragrance-free result does not mean that the garment is unclean.
Remove the underwear promptly after washing
Do not leave washed underwear wet inside a closed washing machine for an extended period.
Moist textiles provide conditions in which odour-producing microorganisms may persist or multiply, particularly when drying is delayed. Laundry-hygiene research identifies washing-machine conditions, residual moisture and drying as relevant parts of odour and microbial control.⁴
If a load cannot be dried immediately:
- remove it from the closed drum;
- separate the garments;
- and allow air to circulate around them.
Rewashing may be appropriate when a load has remained wet long enough to develop a stale or musty odour.
Dry underwear completely before wearing or storing it
Follow the drying symbol on the care label.
Depending on the garment, permitted methods may include:
- tumble drying;
- line drying;
- flat drying;
- or drying in the shade.
Many lightweight underwear garments dry effectively through natural drying, but the correct method depends on the complete garment.
When air drying:
- spread the fabric rather than leaving it folded;
- allow air to reach the waistband and gusset;
- avoid leaving several wet garments compressed together;
- and ensure that thicker seams or layered sections are fully dry.
Do not place clean underwear into a drawer or storage container while any part remains damp.
Tumble drying should only be used when the care label permits it. Heat that is acceptable for a durable cotton section may still affect elastic components, lace, prints or bonded details.
Drying is part of the hygiene process, but the hottest possible drying method is not automatically required.
Keep clean underwear from being contaminated again
A complete washing routine continues after drying.
Handle clean underwear with clean, dry hands and store it in a dry location.
Avoid placing washed underwear:
- back into the unwashed laundry basket;
- on a visibly dirty surface;
- in a damp bathroom drawer;
- or in a sealed container before it is fully dry.
Clean the laundry basket periodically, particularly when damp or heavily soiled garments are placed inside it.
The washing machine also requires routine maintenance. Detergent residue, lint, stagnant water and repeated low-temperature washing can contribute to odour or buildup in parts of the machine.
Follow the manufacturer’s instructions for:
- cleaning the detergent drawer;
- wiping seals;
- checking filters;
- ventilating the drum;
- and running a maintenance or cleaning programme where provided.
A clean garment can pick up odours or residues again when the washing and storage environment is poorly maintained.
Ordinary wear and special contamination are different situations
This article addresses everyday household underwear worn under ordinary conditions.
Different handling may be needed when underwear has been affected by:
- vomiting or diarrhoea;
- faecal incontinence;
- a diagnosed transmissible infection;
- a healthcare or caregiving situation;
- substantial blood contamination;
- or another unusual biological hazard.
In these situations, do not assume that the ordinary routine in this article is sufficient.
Follow:
- advice from an appropriate healthcare professional;
- applicable public-health guidance;
- the washing-machine instructions;
- and the garment’s care limitations.
Special circumstances may require separate handling, controlled temperatures, an appropriate disinfecting process or disposal of an item that cannot safely tolerate the required treatment.
The need for a special hygiene result should not be used to justify exceeding the care label without understanding the risk of damage. When the garment cannot tolerate the required treatment, another method or replacement may be necessary.
Common underwear-washing mistakes
The following practices can reduce cleaning performance or damage the garment:
- wearing underwear more than once before washing;
- ignoring the care label;
- selecting the temperature from the main fibre alone;
- assuming that all cotton underwear can tolerate high temperatures;
- mixing pale underwear with unstable dark colours;
- washing delicate underwear with heavy or abrasive clothing;
- failing to pretreat visible stains;
- scrubbing stains aggressively;
- using more detergent than instructed;
- overloading the washing machine;
- choosing a mild programme but using an incompatible high spin;
- assuming that a laundry bag makes every programme safe;
- using bleach or disinfectant without checking the label;
- judging cleanliness only by fragrance;
- leaving washed underwear inside the machine;
- storing it before it is completely dry;
- or treating routine household laundry as though it requires sterilisation.
Avoiding one mistake does not compensate for another.
A high-temperature wash, for example, cannot correct poor detergent dosing, severe overloading or delayed drying.
A practical underwear-washing routine
For ordinary everyday underwear:
- Wash it after every wear.
- Read the complete care label.
- Inspect the garment for visible stains and damage.
- Pretreat stains using a compatible method.
- Separate colours, fabric weights and incompatible care requirements.
- Keep highly delicate garments away from heavy or abrasive clothing.
- Use a suitable detergent in the correct dose.
- Select a programme and temperature appropriate for the complete garment.
- Avoid overloading the machine or wash basin.
- Ensure that the garment is adequately rinsed.
- Remove it promptly after washing.
- Follow the labelled drying method.
- Allow the entire garment to dry completely.
- Store it in a clean, dry place.
- Use separate professional or public-health guidance for unusual contamination or illness.
The correct process may differ between a durable cotton brief and a garment containing lace, high levels of elastane or heat-sensitive construction.
They share the same need for appropriate hygiene, but they do not necessarily share the same washing conditions.
The most useful rule
Wash underwear after every wear using a complete process that removes ordinary body soil, remains within the care boundary of the garment and leaves it thoroughly rinsed and fully dry.
Hygienic washing does not mean selecting the hottest programme by default.
It means matching the sorting, stain treatment, detergent, temperature, programme, rinsing and drying to both the garment and the conditions in which it was worn.
Sources
- GINETEX, Care symbols ↗
- American Cleaning Institute, Laundry Basics ↗
- American Cleaning Institute, Laundry Products and Detergents ↗
- S. E. Abney, M. K. Ijaz, J. McKinney and C. P. Gerba, Laundry Hygiene and Odor Control: State of the Science ↗, Applied and Environmental Microbiology, 2021.
Related articles
What temperature should underwear be washed at?
What detergent is best for lingerie?
How to remove period blood stains from underwear