Cleans and refreshes exterior surfaces by removing dirt, mold and mildew stains in just 10 minutes. This ready-to-use cleaner works on most exterior surfaces. Use before staining for truer color and more lasting protection. Cleans and refreshes exterior surfaces including wood decks, composite decks, concrete patios and pavers. For use on wood decks, siding, fences, railings, steps and most exterior surfaces including concrete, brick, tile, stucco and composite decks.