I’ve been using crumpled aluminum balls in the dryer for a couple of years now. They work to eliminate static, but they do have drawbacks. You wind up finding aluminum balls in your pockets, pillow cases, etc. Plus small pieces of aluminum break off and get everywhere. And they are noisy.
I read recently that tennis balls could do the same thing. I found two that were abandoned by the cat. So I threw them in the dryer recently and the worked wonderfully! Even better than aluminum. And they haven’t turned up in a pocket yet! And yes, 2 tennis balls in the dryer are noisy, but not near as noisy as the aluminum balls!