Our Tile Roof Cleaner removes stains caused from dirt, grime, mold, mildew, black algae, moss and lichen. The result is a clean that lasts longer than traditional cleaners because of our products ability to stick to roof tile longer to clean more effectively prior to rinsing. As with all of our products, you do not need to worry about covering or wetting down your plants, our products will not harm the landscaping. Our product does not contain chlorine bleach, our product is hydrogen peroxide based, bleach doesn't clean all that effectively a lot of the time, it's making the dark roof stains "translucent" by "bleaching" them the same result as if you spilled bleach on a black t-shirt. The shirt and threading are still there but they are now white. On a roof "white roof algae" can't be seen from the ground until the next blooming season, then guess what? The whole roof blooms black again. That is not the case when you clean with our product, when you do the stains are gone! The best part of our product is the ability to clean on its own, it's simple to keep a roof clean, once you have cleaned it initially just spray the roof once or twice a year from the ground with a garden hose attachment and you will never need to clean your roof again. It’s called a "roof maintenance program". This is how thousands of southern state residents are keeping their roofs clean without hiring roof cleaning companies and spending hundreds or thousands of s in roof cleaning bills each year.do it yourself, it's simple. Mix ¾ cup per gallon of water, mix well, stirring frequently, allow solution to fully activate for 15 minutes prior to use. Apply with "garden style" pump sprayer; allow product time to dry, pressure wash off.3 lbs. will treat 900-1200 sq. ft. of roof, 10 lbs. will treat 3,000-4,000 sq. ft. of roof, 40 lbs. will treat 12,000-16,000 sq. ft. of roof.