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Another really good one is something you may not have though of before - that old bottle of hydrogen peroxide that's in the back of your medicine cabinet. It turns out that it works incredibly well as a stain remover on clothes.
All of my shirts that I wear on the boat seem to have stains on them. The galley is small, and I cook a lot, so I inevitably end up wearing food of some sort or another. The night before I go to the laundry I squirt hydrogen peroxide all over the stains, soaking them really well, and then stuff them in the laundry bag. I wash as normal the next day and voilá! Stains all gone. I even use it on colored clothes and it doesn't bleach out the color like bleach does. It has worked on greasy stains, colored stains like strawberry, and just about any other type I've used it on. Hairspray still works the best on ink stains though. Happy laundry day!