Stay Clean I/E is a mildewcide paint additive designed to inhibit mold and mildew growth on the interior and exterior surfaces. Simply mix this odorless additive into any Sashco — it won’t coil or latex based paint, stain or sealant. It can also be mixed with wallpaper adhesive. Stay Clean will not change the color of your finish and may be applied to interior and exterior surfaces, including bathrooms, kitchens, decks and more. It will last 3-5 years depending on conditions.