In article , Grandpa Chuck wrote:
We tried almost everything recommended to get our two cats to use
their litter pans and they do a pretty good job of it. However,
regardless of how often we clean and/or change the litter they still
go to the basement and **** on the floor up against the wall and the
riser for the bottom step.
[...]
Anyone have any suggestions that do not involve harming the cats?

Give them away to a good home?