SO heres the deal I have a 259 poly bock machined with new cam bearings ect. Ive disassembled the block and want to clean up the outside of the block so i can paint it up all pretty. Ive tried the wood bleach oxalic acid stuff before and it did pretty good. I know it is a relatively weak acid and as far as i can tell it would have to reaction in solution with the matrials in the bearings but i may be wrong. Anyone have objections.