I have had great luck with cleaning CE2 and regular attys with Polydent tablets. Cover the attys with water in a cup, add polydent tablet, and let soak for 12 hours, then rinse thoroughly with hot water and dry in a 200 deg oven for an hour...or let them drain and sit for a couple days. Brought many a 510 atty back to life this way. Alcohol soaks were a good way to kill them, in my experience. I don't use these attys anymore, prefer to build my own, but I had some attys last many months this way.