so i thought i cleaned my block well, serious scrubbing with hot soapy water and a good rinse, but it seems there is still a film of oil on it in some places.

what is the best way to really clean it off to prep it for paint? can i just wipe it down well with a rag and lacquer thinner?

oh, and it's already a long block and mostly taped off. i figured this out as i realized the tape was not sticking well at all to the block.