> I seldom use anything but a good sharp stainless steel scraper. (I make
> them myself from stainless steel putty knives. Sharpen them on a grinder
> and then with a stone.)

This is the approach I took and it worked great. The razor blade was
too flimsy and the scraper too dull until I combined the best of both
worlds.

Thanks, everyone, for the replies! Including N8N for the neoprene
gasket tip.