Kendra, sorry to get back so late when you tried so hard to help me.
They were out of the "ZEP" green you told me about so I got the Zep orange stuff.
First off, the "Goof Off" stuff didn't do anything!!!!!!
So I tried the Zap and it was probably 30% better, however you have to spray it on heavy and let it soak in for 5 to 10 minutes. Then, use a scraper like you use to get the ice/frost off your windows in the winter. Its odd, the stuff is chrylastized so nothing seems to break it down but if you keep chipping/soaking at it, you can get it up, but it's slow, very slow.
An area about 15x6 inches took me about 2 hours to completely clean (soaking/waiting/scrubbing)! The first few lawyers are not all that big a problem but when you get to the last of it, it is definitely a "chip it away" type situation.
I seem to have run out of space/comment area for this area, thats sad!!!