Has anyone ran into it here? I have three sites of the same customer that has cold in the coolers. We can clean it up and in a couple of weeks we have signs of it again. This is showing up on all the shelves, walls and refrigeration equipment. The customer cleans everything but the refrigeration equipment which we do.

1. What causes this.
2. What can be done to prevent it in the future?
3. Yearly PM's are done, can we do something then?