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.
Removing asphalt shingle siding.
The hard brittle shingle siding and roofing that was used on many homes before 1980 often contained asbestos and should be tested before being disturbed or removed.
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.
If asbestos is found to be present the following safety precautions should be taken if the siding or roofing is disturbed or removed.
In some cases you can.
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.