We've been using them sporadically for about a year now, once in the litter box and more recently just as shoe liners. I don't think they worked in the litter box at all and we had a lot of them around us. We tried exposing her to the sun but that didn't seem to restore her. As for the shoes, they might work, but I'm not entirely sure. I don't smell shoes when I walk into a room, but again I wonder if I'm going blind.
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