How do I use it?
Start by rinsing the garment in cold water to remove as much bleach as possible. Then pour a little pure white vinegar directly onto the stain. Let it sit for a few minutes, then gently dab with a clean cloth. Rinse again and let it air dry. If the stain persists, you can repeat the process once. To enhance the effect, some people add a pinch of baking soda or a little rubbing alcohol. However, be careful: never mix these products with bleach that is still active, as this could release toxic fumes.
Goodbye white rings: two foolproof tips to remove a bleach stain from clothing