Squirrel the cat has a secret shame. New kitty litter doesn’t impress her. In fact, she is so unimpressed she likes to show us on the bathroom floor. We have tried cleaning the litter constantly, setting up different litters and giving her treats when she actually uses the litter. She is not sorry.
Put an orange spray on the places she "marks". Any pet store should carry it. I had a little guy that would do that, too!