My cat has started urinating all over everything?

Your cat could have a urinary tract infection. Anytime a cat starts peeing outside the litter box there is reason for concern. This is often the way the cat will try and tell you something is wrong. I would have her checked at the vet, and the sooner the better. If she has an infection, it will continue to get worse and could affect her kidneys. If an infection is not the cause, it could be that she smells the old urine and she will continue to go in places where she went before if you dont completely remove the smell. I have lots of cat care info on my blog if you are interested.