Both of the substances you mentioned have had certain chemicals taken out of them because of EU regs.
The dash top will sand down really easily (once you've cleaned all the gunge you've put on there), or try some proper paint stripper like Langlow Strip Away Pro.
Thanks, I thought the paint was bomb proof, as the only thing that removed the paint was Bilt-Hamber's Deox-C and Deox-Gel as the manufacture states is 'harmless, non-toxic and biodegradable'.