Cleaning gasket surfaces
A few years ago someone on this site was recommending carbide tipped gasket scrapers. I bought one to try and it is pretty awesome. The tip is not deteriorating like regular steel or plastic scrapers. That means it stays sharp and allows it to cut through really caked on gaskets and sealers. Just be careful as it can dig in to the base metal you are cleaning if you force it to. Keep a low attack angle and it works very well.
81960 5/8" Carbide Scraper, 8"