My company is a orthopedics cutting tool manufacturer. Now we are required by one of customer to do process validation on electropolish and other special process. For OQ protocol of electropolish, does anybody have any suggestion on what should be the output of electropolish. My question is what we need to test to evaluate the performance of electropolish. My customer requires me to test cytotoxicity to make sure there is any acid residual after electropolish, but I don't think it is necessary.