What clean pennies better pepsi or rootbeer?

This is a fun question, but it doesn't really make sense in the real world. Here's why:

* Pennies are made of copper, not metal that reacts with soda. Pennies won't change color or clean up significantly when placed in either Pepsi or root beer.

* The "cleaning" is likely a misconception. The change in appearance people see is probably due to the soda's color transferring to the penny, not actual cleaning.

So, to answer your question directly, there's no scientific or practical reason to believe one soda would "clean" a penny better than the other.

It's a great example of how our brains try to find patterns and explanations, even when none exist!