[tetris11]

I don't really believe it though. How deep does that sensor penetrate? If I put a clean bowl in front of it and the rest are all dirty, does that affect the wash?

I'm sorry, but I'm going to keep pre-rinsing. It takes 5 seconds.

[taberiand]

The sensor isn't in the main compartment, it's in the back reading the water (not a specific bowl or other item)

[bryanlarsen]

It measures the turbidity of the water in the hose. You can't put a clean bowl in front of it.