We just bought 2 new cat pans, they are the covered ones. In the past we had 3 uncovered ones for our two cats. After a few days of having the two covered pans together we found pee on the floor. It is tile and cement down there, They seem to poop&pee on the cement. I saw in your earlier post Richo that I had to get some cleaning products to get the smell out. What do you recommend for cement and tile? We already tried mopping with ammonia but that didn't seem to help...we decided to seperate the cats but when one gets in from the garage, and we look later we find pee! That happened once, the evidence seems to point at our tabby cat but we are not sure yet.