...I use the chem dip from autozone. I have two cans of it. The first is the "pre-wash"...its the dirty can where I dip carb bodies that are in need of serious overhaul. After that I clean them up with my favorite degreser and soapy water. Then they go to the "clean" can of chem dip for a few days, then the same treatment of soapy water to get the glaze off them, at this point they should be ready to go. I've had good results with this process...