One of my cats is a total clean freak! If she has used the litter tray even just for a number 1 then how dare I expect her to use it again! To be honest we found that when we installed a cat flap the problem went away. Only issue we have now is when its raining and she can't decide whether to use the tray or go outside. We have had to occasionally stuff her into the litter tray where she duly goes and the look of relief on her face when she comes out is hillarious!

We truly are their slaves