How could you design a dishwasher to always be able to tell whether the dishes are clean or dirty? [closed]

1. Do dishwashers detect how dirty dishes are?
2. How do you know when dishes are clean?
3. What are the three most important rules when using a dishwasher?

Do dishwashers detect how dirty dishes are?

"You may actually get worse results with your cleaning if you pre-rinse things than if you don't," he adds. That's because most dishwashers have sensors inside them that sense how dirty your plates are; they wash your dishes with a suitably strong jet.

How do you know when dishes are clean?

Pay attention to how the dishes feel.

While dishes may sparkle after giving them a good cleaning, there could be leftover residue or caked-on food. One way to tell if a dish is still dirty is if it has a gritty, greasy, or soapy feel.

What are the three most important rules when using a dishwasher?

Avoid overloading.

Crowing glasses and plates can cause them to chip or break (and they won't get clean either). Allow the machine to cool before reaching in to prevent burns from the steam. After loading or unloading the dishwasher, close the door, so others won't fall over it.