You also might want to stay away from high heat. Seems all croc pots are not created equal. I only use low.
A while back I posted that I was going to try antifreeze in an ultrasonic cleaner. You would think that would be the ticket, especially since mine is heated. Works, but not as good as I thought it might have. May try it again and use some of the antifreeze from my croc pot since I know .for sure it is the old/real/good stuff.
Ed M.