I used these (and the plastic/rubber ones with little nubs on them) for awhile at my last place. The laundry room had a linoleum floor that was easy to keep clean, so when the balls inevitably went a-rolling after getting caught in a blanket or towel it wasn’t a big deal. Laundry at the current place is in a basement… yeah, the first time one of the wool balls got away it was pretty grody even though the floor was swept regularly. The plastic ones were easier to clean, but without a utility sink handy they became a pain to use. We eventually gave up and went back to dryer sheets. 😕