Scrape off as much crud as you can, then spray/douse with Castrol Super Clean or Simple Green and scrub. When everything is spotless, wipe it down with laquer thinner and paint it.
have you used this method before? i have some simple green that i could try out...getting abrasive cleaner, a wire brush or a power washer are also good suggestions as well...If i can scrub off most of the crap, then sand it that would be great...ill try using a wire brush also if the simple green doesnt work....but man are these parts ever covered in grime, so i foresee alot of scrubbing taking place...any other suggestions?