How do i get rid of cat odors in a house?

You need to use products that remove ammonia, if the cat is using carpets/clothes as a litter box. Most pet shops will sell various sprays for this. Cat urine has ammonia in, which is what attracts the cat to use the same spot again and again.

If your cat is using the litter box, but has strong-smelling faeces, it may indicate a poor diet. Contrary to popular belief, a cat's stool should not smell strongly at all, and is often due to being fed a poor quality food, often full of grains and other cereals.

If your cat allows it, you can also try a covered litter tray. This will contain any smells better than an open tray. If this is not possible, then sprinkling Baking Soda in the litter itself will help mask odours.