If you take a wet garment out of the wash and see that it's still stained or dingy, do not even think about drying, unless you want the stain to set. Instead, repeat the washing process again. If it's an aggressive stain, consider applying ammonia directly to it, soaking it for 10 minutes, and then putting it back in the wash, by itself, for another go.
Rinse and Repeat
From Our Partners