Well, I forgot to add some of those magic anti-foam drops to my starter wort and it blew some krausen through the foil top that I had on the flask. It wasn't so bad and I let the starter finish as it should, but now I'm left with a stir plate with a bunch of hardened yeast / wort on it. Any advice as to how to clean this? Obviously I don't want to get it too wet. I've tried a wet paper towel, all purpose cleaner, and even my fingernail, but nothing seems to get it all the way off.