Accidents happen. Whether it’s from a child, a pet, or a medical condition, urine stains on a mattress can be frustrating, especially when the urine has already dried. Once dry, urine becomes much harder to remove because it sets into the mattress fabric and foam. Besides the stain, the strong ammonia odor can linger and disturb your sleep quality.
Cleaning a mattress isn’t as simple as throwing it in the washer. That’s why learning how to properly remove dried urine from a mattress is essential for maintaining a clean, fresh, and healthy sleeping environment. This guide will walk you through everything—from why urine is tough to remove, to the exact methods and tools you need to get your mattress looking and smelling like new.
Why Dried Urine is Hard to Remove
Urine contains a combination of water, salts, and waste compounds like uric acid and urea. When urine dries on a mattress, the water evaporates, leaving behind uric acid crystals that cling to the fabric and foam. These crystals are not easily removed with water alone and require special cleaning agents to break them down.
Human and pet urine also differ. Pet urine tends to be more concentrated and contains more ammonia, making it even tougher to remove and more pungent in smell. Furthermore, if not cleaned properly, urine can seep deep into the mattress layers, leading to long-lasting damage and lingering smells.
Understanding the composition of dried urine helps you know why basic wiping or spraying won’t work—and why the right techniques matter.
What You’ll Need
Before starting the cleaning process, it’s important to gather all the necessary materials. You can use both household items and commercial products.
Household Supplies:
- Distilled white vinegar
- Cold water
- Laundry detergent or mild dish soap
- Baking soda
- Spray bottle
- Clean towels or cloths
- Vacuum cleaner (preferably with an upholstery attachment)
Stronger Options:
- Hydrogen peroxide
- Enzyme cleaner (especially for pet urine)
- Borax (optional, for extra strength)
These items help break down uric acid, neutralize odors, and absorb moisture effectively.
Step-by-Step Cleaning Methods
Vinegar & Detergent Method (Ideal for Dried Urine)
This is a great starting method using everyday household items. Here’s how:
Step 1: Mix Your Solution
In a spray bottle, mix:
- 2 parts cold water
- 1 part white vinegar
- A few drops of mild laundry detergent or dish soap
Step 2: Spray Generously
Spray the solution directly onto the dried urine stain. Be generous—you want to soak the affected area so it penetrates deep.
Step 3: Let it Sit
Let the solution sit for at least 15 to 60 minutes. For older or deeper stains, cover the area with plastic wrap and let it sit overnight.
Step 4: Blot the Area
Use clean towels to blot up the moisture. Press firmly but do not rub, as rubbing can push the urine deeper.
Step 5: Apply Baking Soda
Once the area is mostly dry, sprinkle a thick layer of baking soda over it. Baking soda absorbs moisture and neutralizes odors. Leave it for 8–10 hours or overnight.
Step 6: Vacuum the Area
Use a vacuum with an upholstery attachment to remove the baking soda. Repeat the process if needed.
Hydrogen Peroxide & Baking Soda Booster
If vinegar doesn’t do the trick, try this stronger method:
Step 1: Make a Cleaning Solution
Mix together:
- 1 cup hydrogen peroxide (3%)
- 3 tablespoons baking soda
- A few drops of dish soap
Step 2: Apply to Stain
Pour or spray this solution over the stained area. Be careful not to over-saturate if your mattress is foam-based.
Step 3: Let it Dry
Let the solution sit and dry completely. It will leave a white baking soda residue as it dries.
Step 4: Vacuum Off Residue
Once dry, vacuum the residue thoroughly. This should leave the mattress cleaner and fresher.
Note: Test on a small hidden area first. Hydrogen peroxide can sometimes bleach fabric.
Enzyme Cleaner Option (Best for Pet Urine)
Enzyme cleaners break down uric acid crystals completely, making them especially effective for pet accidents.
Step 1: Choose the Right Enzyme Cleaner
Look for one specifically designed for urine stains (available at pet stores or online).
Step 2: Apply Generously
Spray enough cleaner to saturate the stain fully.
Step 3: Let it Sit
Let the product sit for the amount of time indicated on the label (often 15–30 minutes, sometimes longer).
Step 4: Blot Dry
Use clean towels to absorb as much moisture as possible.
Step 5: Air Dry & Vacuum
Allow to air dry fully and vacuum the area to restore the texture.
Optional Borax Treatment (Extra-Strength)
Borax is a powerful cleaner but should be used with caution.
Step 1: Make a Paste
Mix borax with a little water to create a thick paste.
Step 2: Apply to Stain
Spread the paste over the dried urine area.
Step 3: Let it Dry Completely
Leave the borax paste to dry fully, which could take several hours.
Step 4: Vacuum Thoroughly
Vacuum up the dried paste. Repeat if necessary.
Warning: Use gloves and keep pets and children away. Borax can be harmful if inhaled or ingested.
Drying & Deodorizing
After any cleaning method, drying the mattress completely is essential. Moisture left in a mattress can lead to mold and mildew.
Tips for Effective Drying:
- Use fans to increase air circulation.
- If possible, place the mattress in sunlight for natural disinfection.
- Avoid sleeping on the mattress until it is fully dry (usually takes 8–12 hours).
Extra Deodorizing Tips:
- Even after cleaning, some odor may linger. Repeat the baking soda treatment and let it sit longer.
- Use a fabric spray or essential oil mist for a fresh scent.
Prevention & Maintenance Tips
To prevent future urine stains and odors:
1. Use a Waterproof Mattress Protector
These protectors are affordable and prevent any liquid from soaking into your mattress.
2. Wash Bedding Promptly
If an accident occurs, wash the sheets, blankets, and any mattress covers right away using vinegar and baking soda in the wash.
3. Regular Mattress Cleaning
Vacuum your mattress every 1–2 months to remove dust, hair, and other debris.
4. Flip or Rotate Your Mattress
Do this every 3–6 months to even out wear and tear.
5. Address Accidents Immediately
The quicker you clean fresh urine, the less likely it will become a stubborn, dried stain.
Conclusion
Dealing with dried urine on a mattress can seem like a nightmare, but with the right approach and materials, it’s manageable. Whether using household staples like vinegar and baking soda, or stronger options like hydrogen peroxide and enzyme cleaners, the key is to act patiently and thoroughly.
Taking preventive steps like using a mattress protector, washing bedding regularly, and cleaning accidents quickly can help avoid future issues. Your mattress is an investment—keeping it clean ensures you enjoy a healthy and comfortable sleep environment for years to come.
