system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Does dish water need to have bubbles it in to clean dirty dishes?

For as long as I can remember, first my parents, then my boss at the local pizzeria I worked at, then my wife kept insisting that once the bubbles are gone from the dish water it needed to be changed because the dishes could no longer get clean.  I always argued that made no sense to me because I'm not cleaning them with bubbles.

Is there any truth to this or is this just a common myth?
gpt
Bubbles aren't needed, but the stuff that is needed happens to make bubbles. 

Soap molecules are weird -- one end is very attracted to water, and one end is very repulsive to water. Picture a few molecules forming a ring around some dirt, with their repulsive ends picking up the dirt, and their attractive end helping it dissolve into the water.

Of course, it doesn't have to capture dirt this way. It can also capture air. Because the attractive end is so attractive to water, it creates even more surface tension, making it very easy to bubble.

When you run out of bubbles, that means the amount of dish soap left in is very low. It might not quite mean that there's no washing power left, but there's at least very little.