Urinating problem

Question
All of a sudden, my cat has started to urinate in the kitchen sink!

I have adjusted his litter; done what the experts told me to do and he is STILL doing it.

How can I stop this?

Answer
i am assuming you have already taken him to the vet. I am not sure what you can do to stop it. he is doing it for some reason you just have to figure out the reason and fix it. you will need to keep a close eye on him to see what he does before he jumps in the sink to pee.