The primary use of PPG MILDEW CHECK multi-purpose wash is to clean exterior painted surfaces containing mold, mildew, algae and surface dirt (not imbedded dirt). It is recommended for painted or stained wood siding, aluminum siding, wood fences, decks, stucco, roofing, brick or cement block, concrete walkways or walls and ceramic tile and grout. Proper application of this product will leave a protective shield that inhibits regrowth of mildew and algae. This protection remains on the surface after rinsing and is water insoluble. Films with an acceptable appearance may not allow immediate repainting, however, repainting after 24 to 48 hrs is possible.