For instance, some indoor cats may feel threatened and start spraying in the house if an outdoor cat makes its presence known at the window. Cat Urine Cat urine actually glows in the dark, so if you know it s there, use a UV light to mark the spot. Cat urine is difficult, but not impossible to remove. If the scent is not eliminated, the cat may return to the scene of the crime and repeat the offense. A clean, strategically placed cat box should prevent this problem.
Some cats require privacy, so a box placed in a high-traffic area can lead to trouble.