Ted,
It may not be entirely possible to removed chain grease stains from Cerakote. Cerakote is ceramic particles suspended in a polymer and may have more poreosity than other coatings – meaning that if you get chain grease in it and it soaks into the pores it may embed beyond a detergent’s ability to penetrate and remove it.
Areas such as chainstays that are subject to grease would be better to protect with a 3M clear vinyl such as ClearBra, or any mainstream chainstay protector.
It is also a useful idea to wipe down the bike when cleaning with Bike Lust or even a spray on car wax as a protective layer. That will help seal pores in the coating and provide a sacrificial layer for dirt and contamination to stick to and then wash off.