F&P dishwasher leaving white scum--ideas?
My ~3 year old F&P DW double has been leaving white slinky scum on dishes lately and I can't figure out why. It wipes off and isn't in the water (unless something is precipitating out in the wash cycle). I've switched detergents in case I had a bad batch. Not that. I only fill the detergent cups about half full. I've tried heavy cycles and light ones. Top drawer and bottom drawer. We're on boring city water that hasn't given us any problems before. No softener.
Could it be a drain issue? The machine has been physically moved a bit lately (bad bad plumbers). (Really bad.) Could it be a water intake issue so things aren't being rinsed? Do I need a new one (after what those bad plumbers did to it cosmetically might not be a bad idea grrr...)?
If you can point me in the right direction, I'd appreciate it!