Your favorite T-shirt can be ruined by nasty sweat stains or deodorant residue. The usual washing method will not be able to cope with such a problem, so we recommend that you memorize the method.
A proven method against sweat stains and deodorant marks
Take 2 tablespoons of baking soda, 3 tablespoons of hydrogen peroxide, 1 teaspoon of dishwashing detergent.
In a small bowl, mix all the ingredients together until smooth. It is best to do this with a spoon rather than your hands.
Wet the stains on your clothes with warm water to make sure they are well-moistened.
Apply the resulting slurry generously to sweat stains, especially where there are seams, and leave for 1-2 hours.
Then rinse the item and wash it in the usual way with laundry soap or powder.