To set colors in colored items, soak them for an hour in a mix of 1/2 cup vinegar, 1/2 tablespoon of salt, and 1/2 gallon of water. If the rinse water shows color after an hour, repeat the process. Use this technique only for single-colored items, because multi-colored items may bleed into each other. Multicolored items will likely need to be dry-cleaned.