So I just purchased a bunch of stainless Dual Coil Cartos and Ego Mega Dual Coil Cartos from COV and I have been trying to find info on the best way to clean them. Some have said boiling and/or drying in an oven. Others just say rinse them with water, blow out and dry overnight. I know you can slide the casing off the clear ones and I've heard some say you can do that with the metal ones as well but I don't want to try that and break something. Any advice would be greatly appreciated.