I won't say anything on "KEY DATES" cause you need to be very CAREFUL on how you clean those! (Just soap & water, is all I use.)
As for CLAD, I got a harbor freight tumbler. Works great!
If you try, any ACIDED methods (lemon juice ect.) Check it often, do not let it set to long. Also when done, wash with a baking soda solution. It will stop the reaction of the acid... GL