You can find these lights online or at a local home improvement store. You can also find UV lights with fluorescent bulbs. As long as it’s rated between 365-385 nm, this will work as well, although the LED lights tend to be stronger.

If the room isn’t dark enough, your eyes won’t be able to detect the glowing urine.

For example, if your male cat sprayed to mark his territory on the wall, it may look like a splatter, with a few drips running down the wall. If the cat peed on the floor, you might just see a large round-ish spot. Some cleaning products and other household materials, including wallpaper glue, may glow under a blacklight, so don’t panic if your whole room lights up when you turn on the UV light. Other substances, including some bodily fluids and tonic water, may also glow. Use the location, size, shape, and smell of the spots to determine if it’s cat urine. [5] X Research source

If you don’t spot the stain right away, slowly move outward from the source of the odor.

It’s a good idea to clean further outside of the stain than what you can actually see, in case the stain soaked in and spread out, so don’t worry about perfectly defining the edges. Just make a small mark at the top, bottom, and sides of the stain so you’ll remember where it was.

Cat urine will smell stronger as it breaks down. It will also be harder to clean once it’s set in. For a carpet or fabric, first make sure all urine is soaked up using rags before doing any cleaning.

Make sure you get all of the soap solution washed out. Dry very thoroughly and repeat cleaning, this time with a mixture of equal parts vinegar and water. If you’re trying to clean something that can’t get wet, like leather or wood, skip soaking the area and just blot away as much of the stain as you can with the damp cloth. Let the area dry completely.

You can find enzymatic cleaners at pet supply or home improvement stores, or you can even make your own if you want to. Be sure to read the directions on the product you’re using to make sure it’s safe for the surface you need to clean. You may also want to spray a little of the cleaner on an inconspicuous area to make sure it won’t damage the finish of whatever you’re cleaning. Enzyme cleaners are typically gentle compared to other cleaning products. You can find powdered enzyme cleaners if the item you’re cleaning can’t get wet. Sprinkling baking soda liberally all over the entire area and letting it absorb all the moisture and smells can also help. Leave it on until it is completely dry.