Hi Madeline, when you are cleaning the litter tray do you use disinfectant, it may be too strong or irritating them so they wont use the litter trays. I would suggest leaving a small amount of poop in the tray, rinse out only with hot water or not completely cleaning it so they recognise the toilet area, if using disnfectant use that were they have toileted where you don't want them too, it might help Cheers Michelle [Posted in FML 7135]