Product review (4 stars): Dishwasher Alert
cheap and simple. you stick in on your d/w (has adhesive) and bingo, no more guessing if the dishes are dirty or clean. You swith ity to clean when you run the d/w and switch it back when you're emptying it. It's very easy to get into the routine.
The only downside is that is is stuck on so you have to get another one when you move, etc.