Our commercial dishwasher is leaving really bad white residue on our glasses and silverware. According to the technician, our chemicals (detergent, sanitizer and rinse) is the problem. We have been using the current chemicals for the past 4 months... Now all of a sudden the residue shows up... Our water temp is at 130-140 degrees... What can I do besides buying a more expensive line of chemicals. Or is there anything I should be doing before I change the chemicals?

That doesn't mean that the manufacturer changed the chemistry on you.

This may offer some insight into the problem: Phosphate Dishwasher Detergent

Yep, do a load with a lemonaide flavored kool-aid packet in it.