Boy, I am having a heck of a time getting the old gasket off. I've tried the gasket removed spray and while it does help, it isn't helping much. I've read that you shouldn't use a razor blade or grinder because of the aluminum so I've been try to use a plastic putty knife and a green scotch pad but seem to be getting nowhere. I have tried using a razor a bit but do notice that is makes scratches on the aluminum so I'm trying not to use it. I've spent hours and it doesn't seem to be getting anywhere so I'm at a loss. Help!