Then look at the bathrooms. If they are out of soap or paper towels or the bathrooms are not clean, then you can bet the filter basket on the dishwasher only gets emptied when it's full.
I've worked in a lot of restaurants, I'll eat in very few.
If they’re out of soap or paper towels then the employees’ hands aren’t clean from bathroom visits, either. An absence of hot running water in the bathroom sink is a problem, too.
I too have gotten to where I will not eat out any more than I have to. When I do, I try to be very courteous to the waitress etc.