I’ve used electronic cleaner, or electrical contact cleaner etc. with a lot of success. Lubricates and cleans. I think I got my most recent spray can in Canadian Tire. You need to get in to the back end of the pot and squirt into a space using the thin plastic tube supplied, so that the cleaner penetrates inside the shell. It dries leaving no trace behind and is harmless, but highly flammable while wet. So don’t switch on for ten minutes after spraying and exercising the pots! 🙂
