We have been noticing some tiny black specks on our white plastic cups and Rubbermaid lids. They don't rinse off in the rinse cycle, an they smear when you rub them. They are also on one white surface in the dishwasher.
We can't figure out what they might be. They don't stick to the white Corelle dishes - just plastic.
We clean our dishes really well before they go in the dishwasher - probably more than we need to but old habits die hard. We do have JetDry in the dispenser, so there is a rinse agent in use - it just doesn't work on these specks on plastic.
I am wondering if some rubber gasket is failing bit by bit somewhere.
Any dishwasher detectives out there?