Glass dishwashers are designed to be gentler on glassware. Glass dishwashers have special brushes to scrub the inside of the glasses. With both glass and pot, pan, utensil dishwashers, most commercial style dishwashers come with the option to have special cycles and special racks for glasses, or heavy soiled items. This cuts down on the having to buy more than one dishwasher.
Commercial dishwashers come in many styles. Conveyor, Under Counter, Upright, Pot, Pan, Utensil, and Glass Dishwashers.
Conveyor Dishwashers are considered to the best, because they are the hardest working of all dishwashers. All you do is slide a rack of dishes in one side, and in seconds, your dishes are conveyed out the other side. Conveyor dishwashers aren't recommended for small kitchens, but are crucial for a large kitchen.
Under counter dishwashers are perhaps the most popular, due to compact size. They do have a downfall though, they must be placed in a low traffic area of your kitchen. The unloading and load process can disorder a high traffic area. Upright Dishwashers or Pass Through Dishwashers all work the same way. Load a tray of dishes, and close the door or hood for each washing cycle.