Quote Originally Posted by HWORRELL
I think I would try some Easy Off Oven Cleaner. The old sign painters would use it to remove lettering on truck doors. Another option might be to find a vinyl sign supply house and purchase some vinyl lettering remover.
Might check online @ www.signwarehouse.com

Paint Parts Supply shops should have a vinyl remover for the old vinyl- sided 'woodies' from like the 60s/70s. MEK might also work. Make sure to keep in a well ventilated area.