What type of kitty litter do you use and does your cat like it? How often do you change the litter and scrub the boxes?
me and my cat valentine like the natural pine litter at trader joes but walmat etc has it too
when the liner tears or a smell appears ...more than one litter box was the key to stress free indoor kitty elimination for my sensitive kitty hates dirty litter!
I went to Walgreens and found cat litter perfect for my two kittens... Is has these tiny blue beads that if you squish then it will splash or whatever

The blue beads add a smell so it does not reek or stink.. Perfect for indoor cats.. It has a handle and a blue cap to twist and turn, the brand is purina....

Hoped that helped