How to Find Cat Urine With a UV Light

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!

EditSteps
EditLocating the Urine
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.

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 in any adjacent rooms or hallways.[2]
If the room isn’t dark enough, your eyes won’t be able to detect the glowing urine.

Go to the area where you suspect the urine is located and turn on the UV light. Typically, the urine spot will be somewhere in the area where you can smell it, although sometimes you’ll have to look around a little before you find it. To make the search more efficient, start searching near where you think the cat may have urinated, then work outward.[3]

Look for a glowing yellow or neon green spot. When the UV light comes into contact with the urine, it should start to glow. Depending on how much urine there was, and where it is located, the stain may look like a spot, puddle, splatter, or drips.[4]
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]

Sweep the light back and forth, checking various surfaces. Cats may sometimes urinate on a variety of different surfaces, so don’t just check the floor. Slowly move the light from side to side, checking along the walls and door frames, on top of and on the sides of furniture, and on any bedding in the area.[6]
If you don’t spot the stain right away, slowly move outward from the source of the odor.

Mark the edges of the stain so you’ll know where to find it. It can be hard to remember exactly the size and shape of the stain when the lights come back on. To ensure you know exactly where you’re supposed to clean, use something like tape or chalk to mark a perimeter around the stain.[7]
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.

EditCleaning the Spot
Try to find and clean the stain as soon as you can. It’s not always possible, but the sooner you can get the stain clean, the better your results will be. If you smell cat urine and you can’t find the stain during the daylight hours, try to use the UV light to locate the spot that same evening.[8]
Cat urine will smell stronger as it breaks down. It will also be harder to clean once it’s set in.

Saturate the stain with soapy water if it’s possible. If the stain is somewhere that’s safe to get wet, like your carpet, mix a few drops of dish soap into warm water, then blot the water over the entire stain. Leave it there for about an hour. This will help to loosen the crystals from the cat urine.[9]

Blot away the stain with a damp cloth. Once the soapy water has had enough time to penetrate the stain, blot at the area with a damp, clean cloth. Work from the outside in to avoid spreading the cat urine out past its original spot.[10]
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.

Spray the area with an enzyme cleaner and let it sit for 20 minutes. There are a number of different cleaning products available on the market for use around the home, but to completely neutralize the urine, you’ll need an enzyme cleaner. Saturate the area completely, remembering to apply the cleaner beyond the edges of the stain in case it spread as it soaked in. Directions may vary, but typically these sprays don’t need to be wiped away.[11]
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.

EditThings You’ll Need
Blacklight

Damp cloth

Dish soap

Water

Bowl or bucket

Enzyme cleaner

EditRelated wikiHows
Remove Pet Urine from Carpet

Remove Cat Urine from Wood Floors

Remove Urine Odor from Concrete

EditSources and Citations
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Today in History for 11th January 2019

Historical Events

1925 – Frank Kellogg replaces Charles Hughes on as US Secretary of State
1959 – Hanif Mohammad completes 499 runs for Karachi, then 1st class cricket world record
1963 – Los Angeles night club and music venue The Whiskey A-Go-Go opens (inducted into Rock and Roll Hall of Fame 2006)
1978 – Soyuz 27 links with Salyut 6 and Soyuz 26 (1st time 3 spacecraft link)
1999 – Marty Schottenheimer resigns as head coach of the Kansas City Chiefs
2001 – New York Knicks hold an opponent under 100 points for NBA-record 29th straight game in a 76-75 loss to the Houston Rockets; streak snaps 46-year-old NBA record of 28 straight set by the Fort Wayne Pistons in 1954-55

More Historical Events »

Famous Birthdays

1786 – Joseph Jackson Lister, British optician who perfected the optical microscope by designing the achromatic objective lens, born in London, England
1886 – George Zucco, British actor (Fog Island, Black Raven, Adventures of Sherlock Holmes, Captain Fury), born in Manchester, England (d. 1960)
1894 – Jaroslav Vogel, Czech composer and conductor (d. 1970)
1949 – Daryl Braithwaite, Australian rock singer
1979 – Siti Nurhaliza, Malaysian singer, born in Kampung Awah, Malaysia
1985 – Newton Faulkner, English singer-songwriter, born in Surrey, England

More Famous Birthdays »

Famous Deaths

1944 – Galeazzo count of Cortellazzo Ciano, Italian politician, dies
1954 – Oscar Straus, Austrian composer (Brave Soldier), dies at 83
1963 – Arthur D Nock, English-Americans historian (St Paul), dies at 60
1988 – Isidor Isaac Rabi, nuclear physicist (Nobel Prize-1944), dies at 89
1988 – Pappy Boyington, American combat pilot (United States Marine Corps fighter ace during World War II), dies of cancer at 75
2002 – Henri Verneuil, French-Armenian playwright and film director (Mélodie en sous-sol), dies at 81

More Famous Deaths »

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How to Make Apple Juice

If you have an abundance of apples and are looking for ways to use them up, make apple juice. Cut ripe apples and cook them with water on the stove until they’re soft. Then strain this mixture through a sieve to remove the juice. To make a smaller batch, blend raw apples with a little water and then strain the puree to get fresh apple juice.

EditIngredients
EditStovetop Apple Juice[1]
18 apples

Water to cover

Sugar or honey to sweeten, optional

Makes of juice

EditBlended Apple Juice[2]
4 apples

cold water

Sugar or honey to sweeten, optional

Makes of juice

EditSteps
EditMaking Apple Juice on the Stove
Rinse 18 apples. Since you’ll be leaving the peels on the apples, choose organic apples or apples that haven’t been sprayed with pesticide. Select your favorite type of apple or use a mix of:Gala

Rome

Fuji

Honeycrisp

Pink Lady

Cut the apples into slices. Use a knife and cutting board to slice each apple into about 8 pieces. If you prefer, cut the apples with an apple segmenter that will remove the core at the same time.There’s no need to remove the cores, seeds, or peels since you’ll be straining it all out.

Put the apples in a pot and cover them with of water. Place the apple slices along with any cores into a large pot and put it on the stove. Pour in enough water to come 2 in (5 cm) up the side of the pot.If you pour in too much water, you’ll dilute the juice.

Cover and simmer the apples for 20 to 25 minutes. Turn the burner to medium-high so the water begins to boil. Reduce the heat to medium and put the lid on the pot. Let the apples simmer until they become very soft.Remove the lid and stir the apples occasionally to ensure they cook evenly.

Place a fine mesh strainer over a bowl or pitcher. If you’d like to filter the juice, lay a coffee filter or piece of cheesecloth in the strainer. Ensure the bowl is large enough to hold all of the apple juice.
Drain the apple juice through the strainer. Turn off the burner and spoon or ladle the apple mixture with juice into the strainer. Use a spoon to gently push down on the cooked apples so more juice drips into the bowl.
Cool and taste the apple juice. Leave the juice in the bowl to cool to room temperature and then taste it. If you’d like the juice to be sweeter, stir in a little sugar or honey. If the juice tastes too strong, pour in a little water to dilute it to your liking.
Refrigerate the apple juice for up to 1 week. Pour the apple juice into an airtight container and keep it in the refrigerator. For longer storage, freeze the apple juice for up to 6 months.
You can also can the apple juice and store it for 6 to 9 months in your pantry.

EditBlending Raw Apple Juice
Rinse and cut 4 apples into quarters. Set the clean apples on a cutting board and remove the cores and seeds. You can leave the peels on the apples. Then cut each apple into 4 equal sized pieces.Use your favorite apples or try a mix of Gala, Fuji, Ambrosia, Honeycrisp, or Pink Lady.

Put the apples and of cold water into a blender. If you don’t have a high-speed blender, put the apples and water into a food processor. Put the lid on the blender or food processor.
Turn the blender to low speed before increasing to high. Give the blender blades a chance to grab the chopped apples before you slowly turn the speed to high.
Blend the apples for 45 seconds on high speed. If your blender has a tamper, use it to push the apples down towards the blades at the bottom. If it doesn’t, turn off your blender once or twice and use a long spoon to push the apples down.The apples should be completely pureed.

Drain the apple juice through a fine mesh strainer. Set a fine mesh strainer over a bowl and spoon the pureed apple with juice into it. Let the juice drain through the strainer for about 10 minutes.You may need to stir the puree a little to release pockets of the juice.

If you’d like to filter the juice, line the strainer with cheesecloth before you strain the apples. Then you can lift up and squeeze the cheesecloth to release the juice.

Serve the apple juice immediately. Pour the juice into a glass and taste it. If the juice isn’t as sweet as you’d like, stir in a little honey or sugar. Enjoy the juice right away or cover and refrigerate it for up to 1 week.If you’d like to double or triple the batch so you can preserve it, can the juice and store it for 6 to 9 months. You can also freeze the juice in an airtight container for up to 6 months.

EditThings You’ll Need
EditStovetop Apple Juice
Knife and cutting board or apple segmenter

Large pot with lid

Spoon

Bowl

Fine mesh strainer

Cheesecloth or coffee filter

EditBlended Apple Juice
High-speed blender or food processor

Knife and cutting board

Vegetable peeler

Bowl

Fine mesh strainer

Cheesecloth

EditRelated wikiHows
Spice Up Apple Cider

Make Apple Cider

Ferment Apple Juice

EditSources and Citations
EditQuick Summary
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