Originally Posted by brocktoon
I owe you a beer next time you're in the north bay. I'll owe you two if you tell me how you got the housing so clean.
Water based degreaser, scrub, rinse, phosphoric acid (mag wheel cleaner) left to soak in for 2 minutes only on wet surface, scrub while rinsing to remove all residue immediately. I use the acid a small area at a time becuase its very hard to keep a consistent result. Some splotchiness is unavoidable on rough castings. Finally after drying for a day, I use a blast of contact solvent to get as much etching residue out of the pores as possible. It's a process, but takes little time.