Well I haven't got any Acetone... .....when I worked at British Celanese we used thousands of gallons of the stuff, every day. You have to be very careful when handling it, its EXTREAMLY volatile and explosive and dries your skin like mad. I've managed with a long soak in detergent, all ready for going back together now. Crusty. SNIP>>>> All the tar-like deposits on the fuel tank parts will clean up nicely with a soak in acetone Martin SNIP>>>> Chris Parnham wrote: >I've just removed French's petrol tank. It looked a bit dirty in there, but >I'm surprised by the dried black crappy gunk completely covering the filter >and other internal parts, that was floating around in the old petrol. > >I would strongly