How to Wash Underwear by Hand and by Machine

Quick answer

Wash underwear by hand in cool water with a gentle detergent, then press out the water and air-dry. For machine washing, use a mesh bag, a cold delicate cycle, and low heat or air-drying. Modal underwear laundry benefits from the same approach because heat and rough washing break down the soft, stretchy fibers over time.

Underwear takes more wear than almost anything else in your drawer, so how you wash it decides how long it stays comfortable. The good news is that you do not need a separate routine for every fabric. A simple, consistent underwear care routine handles most pairs, whether you wash underwear by hand or use a machine.

This guide walks through both methods step by step, with the mistakes that shorten the life of stretchy fabrics and the checkpoints that tell you when a pair is clean and when it is done.

Before you wash: separate and check

Sort underwear by color and fabric before anything touches water. Dark dyes can bleed into light pairs, and heavy items like jeans or towels abrade delicate underwear in the machine. Keep modal, lace, and G-strings in one load and sturdy cotton briefs in another. Check the care label on each pair, because it is the only reliable guide to that specific garment.

Empty pockets, close hooks, and turn printed or embellished pairs inside out. If a pair has a visible stain, treat it before washing rather than after, because heat can set a stain permanently. This two-minute sort is the single biggest difference between underwear that lasts and underwear that pills or stretches out.

• Checkpoint: if the label says hand wash only, do not put it in the machine even on delicate.
• Mistake to avoid: washing new dark pairs with light ones on the first wash, when dye release is highest.

How to wash underwear by hand

Fill a clean basin or sink with cool water and add a small amount of gentle detergent. Submerge the underwear and let it soak for about five minutes. Gently squeeze the suds through the fabric, focusing on the gusset and waistband, where body oils and residue collect. Do not scrub, wring, or twist the fabric, because that is what stretches elastic and distorts seams.

Drain the basin and rinse with cool water until no suds remain. Press the water out between your palms or roll the pair in a clean towel. Never wring a modal or lace pair, and never hang a wet pair by the waistband, because the weight of the water pulls the elastic out of shape.

• Checkpoint: the rinse water should run clear. If it is still soapy, rinse again.
• Mistake to avoid: using hot water, which can shrink modal blends and fade dark colors.

How to machine wash underwear safely

Machine wash underwear on a cold, delicate or gentle cycle with a low-spin finish. Place G-strings, lace, and modal pairs in a mesh laundry bag so they do not catch on zippers or agitate against heavier items. Wash underwear separately from towels and denim, which shed lint and create friction. Use a gentle or mild detergent and skip fabric softener, which coats fibers and reduces breathability.

If your machine has a hand-wash or wool cycle, that setting is usually the closest match for delicate underwear. Keep the load small so pairs move freely without tangling. When the cycle ends, remove underwear promptly, because leaving damp laundry in the drum encourages odor and mildew.

• Checkpoint: if the machine offers only a hot wash, hand wash instead.
• Mistake to avoid: overloading the drum, which increases friction and speeds up pilling.

Drying and storing without damage

Air-drying is the safest default for all underwear, and it is essential for modal, lace, and anything with a compression waistband. Lay pairs flat on a drying rack or hang them by the gusset, not the waistband. Keep them out of direct sun, which fades color, and away from radiators, which can degrade elastic. If you use a dryer, choose the lowest heat setting and remove items while slightly damp.

Store folded pairs loosely in a drawer rather than cramming them into a tight stack. Give structured briefs and compression styles room so the waistband does not stay bent. Rotating pairs instead of reaching for the same three favorites spreads the wear and keeps the whole drawer in better condition.

• Checkpoint: if a waistband feels stiff or wavy after drying, the heat was too high.
• Mistake to avoid: drying underwear on a hot radiator or in direct sun.

Your step-by-step underwear washing routine

1. Sort by color and fabric: Separate darks from lights and delicates from heavy cotton or towels. Check each care label before washing. Checkpoint: anything labeled hand wash only stays out of the machine.
2. Treat stains before washing: Dab a small amount of gentle detergent onto the stain and let it sit for a few minutes. Do not rub aggressively. Mistake to avoid: washing a stained pair in warm water, which can set the mark.
3. Wash by hand in cool water: Soak for about five minutes, squeeze suds gently through the fabric, then rinse until the water runs clear. Checkpoint: no wringing or twisting at any point.
4. Or machine wash on cold delicate: Use a mesh bag, a gentle detergent, a low-spin cycle, and a small load. Skip fabric softener. Mistake to avoid: mixing underwear with zippers, hooks, or heavy denim.
5. Press out excess water: Roll the pair in a clean towel and press, or squeeze gently between your palms. Checkpoint: the pair should feel damp, not dripping.
6. Air-dry flat or by the gusset: Lay pairs flat on a rack or hang by the gusset, away from direct sun and radiators. If you must use a dryer, choose the lowest heat and remove items slightly damp.
7. Store loosely and rotate: Fold pairs without cramming them into a tight stack, and cycle through your full drawer rather than repeating favorites. Next step: replace any pair with a stretched waistband or worn gusset.

Modal underwear and laundry: what to know

• ChiChi Modal Brief Underwear: High-waisted sculpting bikini brief in Slate grey with a thick compression waistband. Compression waistbands hold their shape best when washed cool and air-dried, so treat this pair as hand-wash or delicate-cycle only.
• It's a G-String Modal Underwear: Made from an ultra-soft Lenzing Modal blend with a flexible, no-dig waistband. A mesh bag on a cold delicate cycle protects the minimal cut and keeps the waistband from stretching.
• Cheeky Modal G-String Underwear 4 Pack - Black: Semi-seamless finish with a flexible waistband that stays put, made from Luxe Lenzing Modal blended with Polyamide and Elastane. Semi-seamless edges snag easily, so bagging these before a machine wash prevents pulls and keeps the no-lines finish intact.

A steady underwear care routine is less about special products and more about cool water, gentle handling, and air-drying. Follow these steps and your modal pairs, G-strings, and structured briefs will keep their softness, shape, and no-lines finish far longer.