I have seen rust on stainless trim and frames where chlorine was present. You may need to install filtration to prevent this. My experience was on manitowoc inside bins, had to use emory cloth to remove it.
It all depends on the municipal or city water supply. I know in
Seattle the water is very soft, BUT... it is somewhat corrosive on the alkaline side. So I have seen the same thing in unfiltered ice machines. and of course we must treat cooling towers with inhibitor as well.