You have been great with the answers and I've tried everything you guys have recommended and all works well.

Now my problem is that when the cats use the litter box, they had scratched some feces on the wall. I need to know what type of cleaner is good for painted walls to remove these feces.

Thank you in advance for all your help.

I have used Clorox Clean-up (for white walls obviously) and something called Simple Green, you can get it almost anywhere I believe :)

Oh, and a good scrubbing sponge that you plan to throw away :)

It depends on what type of paint. If semi gloss or enamel just about any kind of cleaner even some bleach water, wll work. Flat paint, harsh cleaners and scrubbing will cause some of the paint to come off.

Try a product called ODABAN,It smells good,kills bacteria and is not as harsh as bleach.I still use bleach if I'm mopping or scrubbing white surfaces.