And as nasty as this sounds, try soaking a rag with brake cleaner. Dont get it on your hands or in your eyes! it takes off just about anything it seems. I think its mostly acetone.
'68 400HO Coupe, 4 spd, 259 interior, Windward Blue. My other car's a Johnson 15 outboard on a '61 Starcraft rowboat... Just sayin'.