I had one of those too, but i left mine on for about a week, which probably confuse the hell out of alot of people... anyway, i took mine off when it was raining, it came off in one piece, Like DHarrisburg did, with no problems. I didn't even attempt to take it off when i first saw it, because i knew it would tear apart.
so i guess your answer instead of buying solvents and scrapers, just soak it with water.