Dawn dish soap is a miracle! I've always have used this. My dad taught me this method. You can use Dawn alone on men's shirts for the collar. It gets out sweaty grime and stiffens the collar to new! THE best stain remover ever. Even for old stains. Every mom needs this recipe - 2 parts hydrogen peroxide, 1/2 part baking soda and 1 part dish detergent
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ONLY SPOT REMOVER YOU WILL EVER NEED: Mix a 1:2 ratio of Dawn dish soap and hydrogen peroxide (1 part soap, 2 parts HP). Put on stain and watch it disappear. For those stubborn, washed-in stains put the remover on the stain, let it sit for a few minutes, rinsed, and repeat.
How to clean with hydrogen peroxide - Ask Anna
DIY Laundry Stain Remover - 1 part hydrogen peroxide, 1 part baking soda, 2 parts water