anyone aposed to wood bleaching a block???? chemistry?

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.

 

I used it as radiator flush last Spring and it worked great. I left it in my car and drove it that way for two weeks, I doubt you would hurt anything.

 

thanks kinda what i though. did it clean the radiator nicely?

 

It did a great job of cleaning the block, the radiator was too far gone at that point and was replaced. I also added an inline filter to the cooling system for a little extra insurance.