Ballpitts are never washed. Not even once. However, some kids pee in there. This means there is a 100% chance that all balls in ballpits have been peed on, and not washed at some point.

https://lemmy.world/post/21771184

Ballpitts are never washed. Not even once. However, some kids pee in there. This means there is a 100% chance that all balls in ballpits have been peed on, and not washed at some point. - Lemmy.World

They do get washed. Not enough, but they do.