It is not uncommon for roof shingles to turn black over time.
Removing asphalt shingle siding.
Bob the secret material you are looking for is called dewitts remove it it is a citrus based cleaner in a pump spray bottle and works great on vinyl and aluminum siding i am a roofing contractor in akron ohio and over the years i have tried wd 40 choke and carb cleaner kerosene acetone tsp mineral spirits paint thinner and any other cleaner or solvent you could name all were unsatisfatory.
How to remove old asphalt shingles before putting on a new roof.
Merely removing a nail and taking down a siding shingle will not place you in grave danger or any kind of danger.
Roof shingles are exposed to a lot of wear and tear as extreme heat sun wind and precipitation come into contact with them.
Removing asphalt shingles is a big job and you might be temped simply to lay the new roof over the old one.
When that happens it is generally caused by mildew algae mold or dirt stains.
But because one thing often leads to another i e merely removing a nail leads to the temptation to smash a shingle to remove it all because the nail won t come out we are issuing the full set of safety warnings.