Sugar soap.. its alkaline so won't dissolve you fingers too quickly or send you on a trip with the fumes. Oh and its cheaper than thinners etc.
Just use plenty of hot water and fairy liquid, its very good at stripping polish and waxes off and then after that use panel wipe
You should have a automotive paint supplier localish to you... I've never found anywhere else that's cheaper!!
naptha is refined petrol and its what panel wipe is Its also sold as white gas for liquid fuel camping stoves but at a massive price increase
Yes coleman fuel is panel wipe lol but lots more expensive Ive ran my coleman for years on unleaded the just soot up a bit quicker thats all
I only ever use unleaded in mine.. But that is good to know I can bung some panel wipe through it to clean it!!