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How to Find Cat Urine With a UV Light

Source: wikiHow

Co-authored by wikiHow Staff|Reader-Approved |11 References

The smell of cat urine is strong and unpleasant, but the stains can sometimes be hard to find! Luckily, you don’t have to rely on your nose alone to help you find the source of the odor. Instead, try using a UV light, also known as a black light.

If you shine the light in a dark room, cat urine will glow yellow or green, making it easy to see exactly where you need to clean. Once you find the spot, neutralize the urine with an enzyme cleaner!

  1. 1 Purchase or borrow a UV light between 365-385 nm. For the best results, look for a handheld LED light with 9-12 bulbs. It should be rated between 365-385 nm, which stands for nanometers. A lower rating won’t be strong enough to light up the cat urine, and a higher rating is too similar to natural light to have an effect.[1]
    • 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.

    Did You Know? Nanometers are used to measure the visible light spectrum, or the light that can be seen by the human eye.

  2. 2 Wait until evening and get the room as dark as possible. While you could try to draw all the curtains in the room as tightly as possible, it will be easier to wait until it gets dark outside before you try to use the UV light. When you’re ready to start looking, turn off the lights in the room, as well as the lights…

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