Shingle Shield Roof & Deck Cleaner is a concentrate designed to clean asphalt shingles and cedar shake roofs, wood decks and fencing quickly and easily. ?Shingle Shield Roof & Deck Cleaner is a concentrate designed to clean asphalt shingles and cedar shake roofs, wood decks and fencing quickly and easily. Removes dirt, pollen, mildew and algae stains. Cleans stained cedar shake and asphalt shingle roofs. Cleans pine, cedar, redwood and cypress. Restores original color to woods. Does not contain chlorine or bleach. Active ingredient is sodium hydroxide. Easy, quick spray-on and hose off application. Roof & Deck Cleaner (gal). Concentrated ? cleans approx. 2,000 sq. ft./gal.