I have to agree with John
I find it frustrating to load my KDP- 20, start it and NOTHING happens for 15 minutes! Never seen a DW do that.
I'll try that pre-rinse to get things going for sure. Mine is almost finished restoring, it seems my pre wash soap dispenser is not working, the bimetal motor is not disengaging so the door never snaps open. Once I get over that hurdle it's into service.