Little while back I had an ice machine that would produce ice inconsistently. One of my bosses came in and we replaced the TXV, the ice thickness sensor, and the hot gas bypass solenoid. The guy was getting very frustrated with what was going on and finally replaced the refrigerant in it. It ran alright for a week and then started the same problem. We finally called one of the senior mechanics to come and take a look at it. His diagnosis - the plating on the evap had been worn down. He started interrogating me what I used to clean it. I had always used the ice machine cleaner and sanitizer that we were instructed to use. However, I remembered a previous mechanic at the loaction saying something about using "CLR" to get all the real nasty stuff off. So this senior mechanic flipped out when I mentioned this to him. He told me that's what ruined it (after he calmed down of course). His solution was to spray food grade silicone on the evap every once in a while to keep it "slick". It seemed to work cause we didn't have much issues after that. So has anyone ever encoutered a similar problem and if so what was your remedy?