How to Wash Period Underwear: A Simple Care Routine
By Sustainable Underwear Australia | Published: 2026-10-16
Category: How-to Guides
A practical wash routine that protects absorbent layers, removes odour, and keeps reusable period underwear in rotation for years.
Quick answer
Rinse period underwear in cold water immediately after wearing, then wash on a gentle cycle or by hand with a mild detergent and no fabric softener. Air dry flat or hanging, never in a dryer. This routine removes blood and odour without breaking down the absorbent layers, so your reusable period underwear lasts longer.
Why cold water and no softener matter
Hot water sets protein stains from blood, making them harder to remove, and can shrink or warp the absorbent gusset over time. Fabric softener and dryer sheets coat fibres with a waxy film that blocks the absorbent layers from taking in liquid, so period underwear stops working even if it looks clean. Use cold water and a detergent free from softeners, optical brighteners, and strong perfumes.
What to do when you are out and cannot rinse
If you cannot rinse straight away, fold the underwear so the absorbent gusset faces inward and place it in a waterproof bag or wet bag. Rinse within 12 hours when you get home. Leaving blood to dry for a day or more lets it bind to the fibres, and the longer it sits, the more likely you will need a second wash cycle to remove lingering odour.
How often to wash and how to build a rotation
Wash period underwear after every wear, even on light days, because bacteria can grow in the absorbent core between uses. A set of 5 to 7 pairs lets you wear one, rinse one, and have clean spares ready, so you are not washing every night. Rotating pairs also gives each one a full dry before it is worn again, which protects the waterproof layer.
Your step-by-step period underwear wash routine
- Rinse immediately in cold water: Hold the gusset under cold running water until the water runs clear, gently squeezing the absorbent layer. Do not wring or twist, which can crack the waterproof backing. If you cannot rinse right away, fold and store in a wet bag for no more than 12 hours. Checkpoint: the water should be mostly clear before you move to washing.
- Wash on a gentle cycle or by hand: Use a mild liquid detergent with no fabric softener. For machine washing, place period underwear in a mesh laundry bag, use cold water, and choose a delicate cycle with a low spin. For hand washing, gently knead the garment in cool water for about a minute, then rinse until no suds remain. Common mistake: using hot water or a heavy-duty cycle, which degrades the absorbent layers and elastic.
- Air dry flat or hanging: Lay period underwear flat on a drying rack or hang it in the shade. Avoid direct sunlight for long periods, which can fade colours and weaken elastic. Never put period underwear in a dryer, even on low heat, because heat damages the absorbent core and waterproof layer. Checkpoint: the gusset should feel completely dry before you wear or store it.
- Store clean and dry: Once fully dry, fold and store period underwear in a dry drawer or shelf. Do not store damp underwear in a closed bag, which encourages mildew and odour. Keep them separate from damp towels or swimwear. Next step: rotate at least 5 pairs so each one has time to dry fully between wears.
Products that fit this routine
- 5 pairs of Period Underwear to remote Aboriginal women: For $22, you can provide 5 pairs of period underwear to Aboriginal women in remote communities through Sustainable Underwear Australia. This donation item is offered via DonateMate. If you are building a wash routine for yourself, you can also help someone else start theirs. Five pairs give a recipient enough to rotate while washing and drying, which is the same principle that keeps your own period underwear lasting longer.
- 3 Pack Organic Cotton Quarter Crew Socks - Black: Quarter Crew Socks are crafted from organic cotton and recycled polyester, with arch support, a ventilation panel, and a smooth toe seam. For every 3 pack sold, 3 pairs are donated to someone in need. These socks wash well under the same cold, gentle, air-dry rules as period underwear, so you can run one load for both. The donation also extends the same practical support to someone else.
