There is a filter in the bottom of the dishwasher. Its purpose is to collect large particles of food or whatever is being washed so it doesn't clog your drain.

If you're constantly putting really dirty dishes in your dishwasher you should find that filter, twist it out and rinse it off. It's probably full of nastiness. That nastiness is part of your routine dishwasher cycle until you empty the filter. It might be the reason all your glass is cloudy instead of clear and looking new.

To answer the original question though, I wash the dishes and use the dishwasher as a santizer to clean what I've missed.