TrucleanEX Deck & Roof Cleaner removed up to 15 years of weathering. Cleans and whitens concrete, vinyl siding and fiberglass. Designed to clean the dirtiest pine, cedar, redwood, cypress and birch decks and siding; asphalt shingle and cedar shake roofs; and badly stained and oil spotted concrete in the fastest and easiest way possible. TrucleanEX Deck & Roof Cleaner is a concentrate that dilutes 9:1 with water. A quart makes 2 1/2 gallons and a gallon makes 10 gallons. A gallon diluted 9:1 covers about 2000 square feet. TrucleanEX Deck & Roof Cleaner is water-base. Being free of bleach, it will not harm shingles or bleach wood. No scrubbing needed.