does that stuff Starsan really not need rinsing???

Yup, rinse free.

Tastes great! Less filling!

Don’t fear the foam.

Being pedantic:

Star San is not a cleaner. It’s a sanitizer.

Every cleaner needs to be rinsed.

“No rinse” sanitizers (like Star San)don’t need to be rinsed.

TL;DR, don’t rinse. The foam isn’t just for dance parties anymore.