If they are white shirts: then use Dish Soap and Bleach. I am assuming your dish soap is alkaline. Use a soak cycle.
If they are not white shirts: then just do a quick cycle with dish soap or other degreaser, then a regular wash, and you can treat especially bad cases by applying liquid laundry detergent directly to the stain and letting sit half hour before washing.
If you’re conscientious of your impact on the environment and you only wear these specific shirts when you work out: then it doesn’t really matter if they are stained, no?
If you’re some kind of trendy hippy who believes weird diy hacks on the internet: wash with a can of cola.
NM_Gringo@lemmy.world 1 day ago
Once I started making my own deodorant, which is surprisingly easy, my shirts stopped getting pitted out. There are a bunch of recipes on YouTube and you can buy empty deodorant twist up containers. Bit of a pain but it works.