MyPersonalGuru
After the foods done, I turn my grill up high and shut the cover. I leave it 5 minutes or so before shutting it off. Next I brush with a stiff bristle brush, that usually works for me. I also remember spraying a grate with oven cleaner "Easy-Off" when it couldn't be cleaned by hand, although I don't remember if that grate was porcelain. Good luck!

navinr
i treat a preheated grill grate with a paper towel dipped in cooking oil,use tongs to wipe the grate.just like you do with teflon. soon as you get done eating clean with grate brush flip grate over and do the same. i love to grill! have fun!