Hereâ€™s the scoop on litter box odors: you can easily remove them with this Litter Box Gel. Experience purrfectly fresh air in any basement, bathroom, or pet room with this powerful, odor absorbing, continuous release gel. Simply place the gel near the litter box and funky feline smells are neutralized and eliminated through natural chemistry. Multiple cats in your home? Grab one Litter Box Gel per litter box for the most effective odor relief.