Well, the damage may already be done, but you have some options:

1) Call the mfg and ask what solvent would be safe to use with their finish. If you don't know who the mfg, as whoever installed the roofing.

2) Let the sun do its thing and in time the plastic will disintegrate on its own. However I wouldn't be surprised if it left a mottled finish in its wake.

3) test various solvents in an inconspicuous corner of the roofing and where corrosion would not result in a leak.

You could also try using a hair dryer or heat gun set on low to see if heating up the plastic makes it peel off the roofing easier. This is a trick that auto/motorcycle folks use to remove factory stick on decals from stock bikes.

Sudsmaster, I'm gonna start with the dryer and if that doesn't do it, I'll try the solvent route. Thanks for your suggestions!

Shaven