I dont. Even my kids go to preschool and their clothes has a lot of stains. We tried baking powder and vinegar but didnt work. You can bleach it but i dont allow bleach at home (even though it is our helper washing it). It's too hard on health and they are kids, they get dirty so it is okay :)
I haven't try before but my grandma teach is to use the brand Fab soap to clear it.
try vinegar if not baking soda with water
bleach and wash a few more times
Bleach
Bleach
Throw
Anonymous