Why would a white film form on cutlery but not glassware in a dishwasher?

An odd effect I notice is that I when wash dishes in a commercial dishwasher there is a white film left behind on steel cutlery but not on the glassware, which appears to have no residue. Why would this occur?


I know that the local tap water has high salt content, but if the residue is indeed the salt, why would it preferentially coat the cutlery but not the glasses and dishes?


The cleansers being used are standard commercial liquid detergents and a rinse aid.


