What About Cat Urine Smells?
The really stinky component of cat pee falls under the category of “pheromones.” Male cats and in particular “intact” male cats can have a high level of felinine in their urine. Felinine does initially have some scent to it, but as it breaks down, it gets stinkier and stinkier. This means that when a cat marks their territory in the wild, their scent doesn’t dissipate quickly, which is great for a wild cat, but not great for a domestic cat owner. This is also the part of cat pee that doesn’t get washed away with typical household cleaners. A quick Google search will reveal endless options of enzyme cleaners that will break down and neutralize the sulfur-based compounds.
If your cat’s pee is super smelly it can also be a symptom of a medical issue. If scent of your cat’s pee seems to have changed, get him checked out by your veterinarian to rule out a problem. Also take him to the vet if they START GOING OUTSIDE THE BOX, which can also indicate illness.
And to keep the stink at bay, get your male cats fixed which not only reduces the amount of pheromones in the urine, but also reduces the likelihood of them spraying. Keep the litter box clean and make sure there are enough boxes in the house for the number of cats your have (one per cat, plus one).