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How to clean underwear
Apply stain remover solution onto soiled garments.
You should never put stained clothes into the wash without treating them first, because the water can set the stains. Spray a stain remover, like shout, oxiclean, or your other preferred brand, onto the stained area and let it sit for about 30 minutes.
After the solution has soaked into the stain, you can put it in the washer and run it through the cycle as normal. Put a pinch of salt on blood-stained underwear, and run it under cold water.