I am a retired appliance repairman having 42 years in service.
I have seen this many times. Most often this is caused by Lime in the water. I have not yet heard of a way to filter lime out. Most times lime shows up after a long period of drought then a lot of rain. I have instructed customers to run dishwasher on short wash. This allows the dishwasher to start on wash cycle that opens soap dispenser. That one is the part of a cycle that washes the longest without draining. Use white vinegar by pouring a half gallon into tub then start dishwasher and let it run. Next, find a product called Lemme Shine. Use this as directed by manufacture. This will reduce white residue from building up.
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