Here’s how to get rid of sweat stains on your clothes: These DIY solutions really work, and use items you 
probably have around the house. For delicate fabrics, you can test these solutions on a hidden corner first if you want.
Meat tenderizer
Tenderize away hard-to-remove perspiration stains. Before you wash that sweat-stained sweatshirt, dampen the stain and sprinkle some meat tenderizer on it. Then just wash as usual.
Aspirin
Before you give up all hope of ever getting that yellow sweat stain out of your good white dress shirt, try this: Crush two aspirins and mix the powder in 1/2 cup warm water. Soak the stained part of the garment in the solution for two to three hours.
Salt
Salt’s the secret to getting rid of those stubborn yellow stains on shirts. Dissolve 4 tablespoons salt in 1 quart (1 liter) hot water. Just sponge the garment with the solution until the stain disappears.
Lemons
Avoid expensive dry-cleaning bills! Remove unsightly underarm stains from shirts and blouses simply by scrubbing them with a mixture of equal parts lemon juice and water.
Cold water
To nip sweat stains in the bud, run stain-prone clothing under cold water and gently rub the problem areas before washing. If your clothes already show signs of yellowing, avoid using hot water during the wash cycle because it will set the stains.
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