Mix a Soaking Solution Mix a solution of warm water and oxygen-based bleach (brand names are OxiClean, Nellie's All-Natural Oxygen Brightener, or OXO Brite) following the package directions. Completely submerge the stained item and allow it to soak for at least four hours or overnight. Check the watermelon stain.
The fruits of summer are ripe, sweet and juicy. They're also pesky stain makers. TIP: Watch out for watermelon: The stains from this water-y fruit seem to disappear when they dry. If left untreated, however, the watermelon juice will oxidize into pale yellow or brown stains that are almost impossible to get out.