3 years ago back when I was in High School, in the shop, I seem to recall things you could attatch to an air drill or regular drill. They were like big round erasers that were designed to remove decals/stickers. I don't recall who makes them, or how much they cost, just that these things exist. I saw someone use these and it seemed to leave the paint totally alone. Good luck!
Tim
"The_Sandman_454"
/wwwthreads_images/icons/cool.gif '79 Suburban 4x4 454, 6" lift, 35x12.5s & '85 GMC S15 4x4