http://www.ebay.co.uk/itm/PREMIUM-P..._Body_Shop_Supplies_Paint&hash=item4183c8836b That's the solvent
Wash tank has a pumped brush on it, so I pull off the brush and run the solvent through various oil holes... then I do the same with the panel wipe
Naptha or if you want to get ripped off then buy coleman fuel Ive often thought it would be a fun project to get a type one engine to run on it Its used in some other countries to thin out petrol in remote areas What brand of wash tank solvent or whats its chemical base Ive always used avtur in the past because i got loads of it for free from work