The claim that dishwashers need food to work right
There are threads scattered about with the debate over whether or not to pre-rinse dishes going into the DW and whether DWs actually need food to clean better, but the only one I could dig up devolved into front-loading washing machines.
I'm looking at a Bosch SHE43RL5UC which is in my budget and has gotten pretty good online reviews.
The sales guy and I had a friendly debate over the pre-rinse issue. He claimed it should not be done, the real reason being detergents can etch dishes and glasses if there isn't some food residue. I can buy that reason more than, "it won't clean properly unless food is present."
I'm a pre-rinser from way back. I'm not trying to be deliberately contrary. I live alone and it often takes me 5 days to get a sufficient DW load. I don't want a plate of egg yolk, or dairy or meat incubating in the DW.
One what-if I forgot to throw at him is, what about water glasses at a dinner party? They are essentially pre-rinsed even when they go straight from the table to the DW. What protects them from etching? The undersides of dishes that didn't have food on their surfaces?