I always shake them out because they manage to get food bits, cat litter or cat nip stems in them too🤣 Getting poked in the foot walking down the street and I've had cat litter, cat food and a cat nip stem. My one cat likes to puke over the side of the pub table onto shoes then pretend to bury it with invisible dirt. One did that once on a pair of leather suede sandals. Sometimes step on cat whiskers. I find those around often with 3 of them but my black cat's are always in odd places. I have found 7 different black whiskers in the freezer and one in the bottom and back of the fridge. Now how the hell🤔🤔🤣🤣