Uric acid in cat urine is not readily water-soluble. Ordinary cleaners leave residue that keeps releasing odour, and the cat may keep marking the same spot.

Enzyme cleaners contain protease and uric-acid-breaking components. They need contact with the residue and must stay damp long enough to work.

Blot rather than wipe first, so urine does not spread. Fabrics and floor gaps need particular attention.

Repeated elimination outside the box can signal urinary disease or stress. Beyond cleaning, get a vet check and review box count and placement.