What worked for me was a combination of a few things. I started with a metal scraper or narrow metal chisel and a propane torch to heat the old gasket to soften it enough to scrap the bulk of it off. You just want to be carefull not to put to much heat on the metal itself. Then like stated before after that using some kind of paint thinner or parts cleaner scrub off the rest with a wirebrush, scouring pad and then a rag to finish it off. At one point I tried using a wire wheel on a drill but that just smeared around the messy sealer. No matter what works for you it is still a big job. Good luck, Onebad