If it doesn't come off with dishwashing liquid and hot water, I usually use baking soda. I sprinkle some on the pot and rub with a cloth or sponge. It shouldn't be too wet, just damp, so it's sort of a paste. I do that on the inside of the window in my oven too. For grease on my toaster, I use baking soda completely dry and dry cloth or sponge. It works surprising well. Grease that has been there a while and has a developed a hard, shiny surface will need more elbow grease.