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Look closely at the surface. Felt is their superpower. That fuzzy layer catches static and separates your wet laundry. Over time, that felt wears off, exposing the inner wool. Once the surface gets hard and smooth, your balls are basically wearing a tuxedo to a pillow fight. They look fancy but aren’t helping.

A good rule of thumb: if you can see individual wool fibers poking out like they’re trying to escape, it’s time. If the ball is one solid, dense rock, it’s time.

The Smell Test (Don’t Laugh)

Wool naturally resists odors. But after hundreds of loads in a humid dryer, even wool gets funky. Sniff your balls. If they smell musty or like your aunt’s basement, toss them. No amount of airing out will fix that. They’re holding onto moisture, and that means they’re holding onto mildew.

I once kept a set for three years because I was emotionally attached. They smelled like regret and old cheese. My towels came out smelling worse than when they went in. Learn from my mistake. Don’t be a hero.

We Asked a Laundry Pro When to Replace Our Dryer Balls, and We're So