Ivo isn't interested when I clean the litter box. In fact, she seems wary of the box top, when I take it off (it must remind her of her carrier, which she hates). But, when I'm done cleaning, she comes over and gives the box a thorough sniffing.
okeefecl - my kitty also is extremely wary when I take the top off the litter box, but I think it has something to do with the fact that when I was in college I was always dragging him (with his litter box) from place to place (parents house to my apartment to my boyfriend's apartment) - so now when I approach the litter box he thinks he is going to have to get in the car!
It has been over 3 years and he still remembers - and people try to say cats aren't geniuses!