How do you avoid sunscreen stains on white clothes?
That said, for stains you already have, I have heard that Lestoil and Kaboom work. These are both fairly harsh cleaners, and Kaboom is meant for bathrooms, so be careful with it on your clothes! I haven’t tried them yet. Oxy clean has worked for me on some faint stains – very strong paste, soaked overnight. I have also had some success with bleach, figuring that the clothes were ruined anyway, so no matter if the bleach ruined them further. I have also heard that anything made to remove hard water/rust stains will work.