system
Given the following post, respond as if you're commenting on Reddit:
human
Is soap required to "foam" in order to work properly?
gpt
Nope! Two soaps that don't foam are laundry detergent and the type of soap that goes in dishwashers. If you put a foaming type of soap in either of those machines, it will cause a huge mess. However, those soaps still clean dishes and clothes just fine.

Lots of cosmetics companies actually add things (like sodium dodecyl sulfate or ammonium lauryl sulfate), to soaps to make them foam more, because many people associate foam with cleanliness.