Spay or neuter the cat
Clean soiled areas thoroughly with an enzymatic cleaner
Block access to previously sprayed spots
Reduce stress and territorial triggers
Keep litter boxes clean and accessible
Provide one more litter box than the number of cats
Place litter boxes in quiet, low-traffic areas
Separate competing cats and resources
Use pheromone diffusers or sprays
Cover or remove outdoor visual triggers
Consult a veterinarian to rule out medical causes
Seek behavior help if the spraying continues