How To Get Old Urine Stains Out Of a Mattress: Step‑by‑Step FAQ Guide

If you’re searching for How To Get Old Urine Stains Out Of a Mattress, you’re likely dealing with lingering yellow marks or a stubborn smell that won’t go away. This guide walks you through what works, what to avoid, and how to freshen your mattress as much as possible.

Why Are Old Urine Stains So Hard To Remove?

Old urine stains are tougher because they’ve had time to:

  • Set deep into the mattress layers
  • Dry and oxidize, turning yellow
  • Leave behind odors even after surface cleaning

Fresh stains are usually easier to treat, but older stains can still improve a lot with the right approach and patience.

What Should I Do First Before Cleaning?

Before you start any deep cleaning:

  • Strip all bedding and wash it according to care labels.
  • Vacuum the mattress surface to remove dust and debris.
  • Check your mattress care instructions if available, to avoid any methods that might damage materials.

If the mattress is very wet or heavily soiled, it’s often helpful to blot with dry towels first to remove any remaining moisture.

How To Get Old Urine Stains Out Of a Mattress: Home Method

Here’s a commonly used, gentle approach many people use on traditional mattresses.

Step 1: Blot and Spot-Test

  1. Lightly dampen the stained area with cool water (do not soak it).
  2. Blot with a clean towel to pull out as much as possible.
  3. Spot-test any cleaner on a small, hidden area first to check for discoloration.

Step 2: Apply a Mild Cleaning Solution

A simple do‑it‑yourself option many people use:

  • Mix a small amount of gentle liquid soap with cool water.
  • Lightly dab the stained area with a clean cloth dipped in the solution.
  • Avoid saturating the mattress; work in thin layers.

Blot, don’t scrub. Scrubbing can push the stain deeper and rough up the fabric.

Step 3: Tackle Odor With Baking Soda

Once the area is lightly cleaned:

  1. Sprinkle a generous layer of baking soda over the damp area.
  2. Gently press it in so it reaches the surface fibers.
  3. Leave it for several hours or overnight to absorb moisture and odors.
  4. Vacuum thoroughly using a clean upholstery attachment.

This step is especially helpful if the mattress smells even after the stain is lighter.

What If the Yellow Stain Is Still Visible?

Old urine stains may require repeat treatments. Mild, repeated cleaning is usually safer than one very aggressive session.

You can:

  • Repeat the gentle cleaning and baking soda process.
  • Focus more on blotting and lifting rather than scrubbing.
  • Accept that some older stains may fade but not disappear completely, depending on mattress age and materials.

Can I Use Strong Cleaners or Steam?

Bleach and Harsh Chemicals

Using strong chemicals like bleach or highly concentrated cleaners can:

  • Discolor the fabric cover
  • Be harsh on skin or senses
  • Potentially break down some mattress materials

Most people find it safer to avoid harsh chemicals on a mattress they sleep on daily.

Steam Cleaning

Steam cleaners introduce heat and moisture, which:

  • May damage certain foam materials
  • Can trap moisture deep inside, making dry‑out harder

If you’re considering steam, it’s important to check whether your specific mattress type is suitable and to make sure it dries thoroughly afterward.

How Do I Remove the Smell From Old Urine Stains?

Even after the stain lightens, odor may linger. To help reduce mattress odors:

  • Use baking soda generously and leave it on for longer (up to 24 hours).
  • Keep the room ventilated by opening windows when weather permits.
  • Let the mattress air out in a dry, well‑ventilated space for as long as possible.

Some people also like to very lightly mist the air around the mattress with a mild, fabric‑safe freshener, but it’s generally best not to soak the mattress itself with scented sprays.

How Long Does It Take a Mattress To Dry?

Drying time depends on:

  • Room temperature and airflow
  • Humidity
  • How much liquid was used during cleaning

To help it dry:

  • Use fans to keep air moving.
  • Avoid making the bed until the mattress is completely dry to the touch.
  • If possible, elevate the mattress slightly to allow airflow underneath.

Sleeping on a damp mattress can feel uncomfortable and may make it harder for the cleaned area to dry properly.

Can All Old Urine Stains Be Fully Removed?

Not always. Some key points:

  • Very old or repeated stains may permanently discolor mattress fabric.
  • Odor usually improves significantly, but some faint smell may remain, especially in thick mattresses.
  • The goal is often “much better,” not “brand new.”

Being realistic helps you decide how much time and effort you want to invest.

How Can I Prevent Future Urine Stains on My Mattress?

Once you’ve gone through the work of learning How To Get Old Urine Stains Out Of a Mattress, it makes sense to protect it going forward:

  • Use a washable mattress protector to create a barrier between spills and the mattress.
  • Wash bedding and protectors promptly after any accident.
  • Address fresh spills immediately, before they have time to dry and set.

✅ Quick Mattress Takeaways

Key points to understand about How To Get Old Urine Stains Out Of a Mattress

  • Act gently, not aggressively: Blot and dab; avoid soaking or scrubbing hard.
  • Mild cleaners first: Start with light soap and water, then baking soda for odor.
  • Old stains may not vanish: Expect improvement, but some discoloration can remain.
  • Odor needs extra time: Long baking soda soaks and good ventilation help most.
  • Drying is crucial: Make sure the mattress is completely dry before making the bed.
  • Harsh chemicals carry risks: They can damage fabrics and aren’t always needed.
  • Protection helps long‑term: A mattress protector and quick cleanup keep future stains from setting in.

With patience and a careful approach, you can usually make an older urine stain much less noticeable and more comfortable to sleep on, even if the mattress isn’t perfect again.