Proper chemicals?! Just use a 50/50 bleach solution with a garden sprayer.I very seldom advise people to not do a project themselves but this is one item best left to the pros. Why? Because they have the proper chemicals and pressure equipment to do the job right without damaging the shingles. They will be able to do the job without killing all the plants and grass. Be sure to get references and preferably hire someone with several years experience.
I done this at least 10 times on asphalt shingles, never had an unintended consequence. Actually, I learned this from a professional roof cleaner. If you want to win some, you have to risk some. Ornamental plants?! Get them out of the way.Billy, that will work but you also run the risk of killing ornamental plants with the overspray and runoff. You can also cause discoloring of paints and stains. There are a number of unintended consequences to consider before beginning any job. You also have to consider that these are shingles and not tiles. Roofers just love do-it-yourselfers that weaken their shingles with harsh chemicals and then get up there and blow the stone layer off the shingles with a pressure washer.
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