[pipeous]

A little trick from my heli days to remove the nitro gunk. you'd have to come up with a little creative thinking to adapt for a chassis. to remove the gunk stains from the pipes, we would take an old crock pot and dump the pipe in with automotive antifreeze. they came out all nice and clean. you won't be able to put a chassis in a crock pot completely, and you need to do it outside so as not to breath the fumes, but maybe a hotplate on low and a cheapo baking dish from the dollar store or 2nd hand store would do