How can I verbs my dated dishwasher? Sometimes when I wash dishes near is almost like sandlike granular objects...

Sometimes when I wash dishes near is almost like sandlike granular objects on my dishes. I buy Jet Dry but I was told specifically to prevent water stains on dishwashers. How can I verbs it out? Someone said a cup of vinegar once a month? Please help!
Pine Sol to verbs a tub ?
Answers:    run 4 cup fulls of CLR thru it, [with out dishes] after 2 times a mo run vinagar thru ,till it clears up then 1 cup a month.
switch to gel tab soap, stay away from powder, it will clog up any thing,
the sand stuff is Lime,
Anyone use the Scrubbing Bubbles Automatic Shower Cleaner?
use shot dry in a cycle by itself. For the outside draw from some Bleach and Pine combo set