There are several ways to clean sandals or slides that have yellowed or darkened. You can soak them in a mild baking soda solution for about 10 minutes and then scrub them with toothpaste. Alternatively, dissolve "oxygen bleach" (solid hydrogen peroxide) in water and soak the footwear; its active oxygen components help break down stubborn stains. For surface stains, you can use cleaning wipes containing enzymes-commonly used for white sneakers-to wipe the material directly. To tackle black mold growth, apply a mold-removal gel to the affected areas, let it sit for a while, and then scrub or rinse the footwear clean.
