The armpit stain removal trick requires mixing just one part dishwashing liquid (it says Dawn, but you can probably use any brand) with two parts hydrogen peroxide, then let the mixture sit on the stain for an hour. For the worst kinds of stains, add baking soda and scrub.
If the shirt is of a color and not pure white be careful. Also when it says dawn use dawn. Dawn cuts through grease and what you want is the bodies natural sweat and oils (grease) to be dissolved. Hydrogen peroxide can be used to whiten teeth so imagine what it will do to color on clothing.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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The armpit stain removal trick requires mixing just one part dishwashing liquid (it says Dawn, but you can probably use any brand) with two parts hydrogen peroxide, then let the mixture sit on the stain for an hour. For the worst kinds of stains, add baking soda and scrub.
Have you tried vinegar and baking soda?
https://www.rd.com/home/cleaning-organizing/how-to-get-rid-of-sweat-stains/
https://www.popsugar.com/smart-living/How-Remove-Sweat-Stains-31003483
Soak garment in Oxi-clean and water for a while, Then wash as normal.
OXY CLEAN..made for this type stain
If the shirt is of a color and not pure white be careful. Also when it says dawn use dawn. Dawn cuts through grease and what you want is the bodies natural sweat and oils (grease) to be dissolved. Hydrogen peroxide can be used to whiten teeth so imagine what it will do to color on clothing.