I have a white composition shingle roof only 2 years old, am getting sooty black mold on large areas. I see other homes with same thing. Is there a product to spray or gently scrub the roof shingles that will clean it? Has anyone tried maybe white spray paint? Seems to be only cosmetic damage, no leaks.:confused:

Try a deck cleaner and low pressure water rinse, should remove it. Don't spray paint it!

If you call a roofing comapnay they will tell you what to use.
I was told it is a fungus caused by a tree, since it was only on my porch roof the roofer said I could use bleach water to clean it off. But he tried to sell me on a new roof that had something in it to repel this fungus.

I have used this stuff with great success. Cleaning mold and mildew removal with Jomax. (http://www.zinsser.com/product_detail.asp?ProductID=65) You may also look into installing a Zinc strip along the ridge of your shingles. The zinc washes a minute amount of zinc down the shingles when it rains and this is just enough to prevent mold and mildew.

I am an experienced roofer/siding contractor and in my decades I have never offered a service for cleaning shingles composed of fiberglass petrolium asphalt mineral products. I suspected and still do unless there is offered a marketable product backed by warranty... As for an example and from my own experience, during tearoffs and dealing with wasps along roofing material, most wasp sprays if sprayed on shingles will stain by chemical reaction.. melting the petrolium asphalt causing the mineral to darken into unremoval stain. This to me is an indication that chemicals can shorten the life of roof shingle thereby voiding the manufacturer warranty. If the customer requests cleaning mold using maybe a 10% part bleach, it may work but to which extent it all depends on if the overhanging trees causing the mold were removed or at how serious the mold problem has become. I personally think more harm than good could result sprayingany grease detergent remover etc. on fiberglass/asphalt based shingles. It is best to ignore the mold and just wait and get the most out of the shingles before going a new roof . Unless there is a roofing shingle manufacturer out there with such a product that claims it will safely remove and deter molding, I'm not inclined rendering such service.