Hi Alan
I found the best way to clean the chassis is to prop it up take the wheels off and any other parts inc cab floor frame, engine etc and clean all the crud off with gunk or suitable degreaser and steamclean or pressure wash the worst of it off taking care not to damage oil seals.
Then when all is prepared get a mobile shotblaster to come out and clean the lot, its expensive but is the best and easiest way to get back to bare metal. I used over 30 bags of shot on my truck and as soon as the parts were cleaned I gave them an acid etch primer coat then an anti corrosion coat, is amazing how quick newly cleaned steel will rust.
Cheers RR.
just before start
Chassis with coat of gry anti corrosion
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