How To Remove Mold From Car Window Seals


The window seals on a car don’t dry off easily. That’s why mold forming around the car window seals is pretty common. Mold does not look good and it spreads to other areas. So, you need to get rid of the mold as soon as possible. Here is a guide on how to remove mold from car window seals.

  1. Mix dish soap with water.
  2. Get a toothbrush and a rag.
  3. Soak the rag in soapy water.
  4. Wipe the seals thoroughly.
  5. Dip the toothbrush in soapy water.
  6. Scrub the seals.
  7. Rinse with high-pressure water.

Getting rid of the mold is easy enough, you just have to put some effort into it. More so if the mold growth has been there for a while. Follow this step-by-step guide.

Cleaning Mold From Car Window Seals

Cleaning Mold From Car Window Seals

If you have ever dealt with mold in your house, you know that getting rid of mold is relatively easy. You just have to eliminate the source of the moisture.

However, it’s not the same with mold in cars. The thing is, in your house, you can use something strong like white vinegar. You can’t use vinegar on your car though.

The rubber seals won’t get damaged regardless of the cleaning solution you are using. The window rubbers are too close to the paint job though. And there’s no way to avoid getting the solution on the paint.

That’s why we are going to be using something mild and safe for car paint, dish soap. The average liquid dish soap you have at home can be effective at getting rid of mold growth.

  1. Mix dish soap with hot water.
    There are is no right ratio for the mixture, so just freeball this. Dish soap shouldn’t damage your paint even if the mixture you make is strong. Also, I prefer mixing in a clean water bucket, so you can soak the toothbrush and the rag. You can put the mixture in a spray bottle though. That way, you just spray the seals.
  2. Get a clean rag and a toothbrush.
    I recommend using a wool rag, something rugged, so it can scrub the mold. This is effective but also not safe. If you are using a towel rag, be careful to not scrub the paint too. If you want to go for something safe, use a soft cloth or a microfiber towel. Use any old toothbrush you can find at home. A nylon brush or a paint brush can be quite effective too.
  3. Soak the rag in the soapy water and start wiping.
    Thoroughly wipe away any surface mold. Get inside the seals. Clean the seals on the sides of the window, the ones on the top, and the ones on the bottom. The best way to do this is to put a finger through the rag. And wipe with that finger. Use your nails for those hard to get rid of parts. Open your doors, and cover every inch of the rubber seals. Remember, don’t scrub here, just wipe. Check the rubber seals on the top of the windshield too. Mould & mildew can form there too.
  4. Dip the toothbrush and start scrubbing.
    Now that you have gotten rid of the surface mold, you can start scrubbing. Cover the same areas. Be thorough. Scrub and apply as much pressure as needed. Don’t be afraid to repeat this step 2 more times. The brush should be able to reach those places you couldn’t reach with your finger.
  5. Rinse with a garden hose.
    Rinsing is really important here. The pieces of mold you scrubbed can still be dangerous. So, you want to get rid of those too. We do that with a garden hose that can handle high-pressure water. High-pressure is recommended. That’s why you can also use a pressure washer if you have one.
  6. Wipe the seals with a dry clean cloth. 
    You don’t want to leave the seals moist, mold may appear again. Also, we are going to be treating the rubber to prevent mold growth. This is best done when the seals are dry.
  7. Treat with a vinyl conditioner.
    This step is optional, I highly recommend it though. If mold formed once, it’s going to grow again. You need to prevent that. To do that, we use a vinyl conditioner. There are plenty of products you can use here. I recommend Torque Trim Gel. Just spray the window seals and wipe them away with a clean microfiber cloth.

There you go, you should have no mold anymore. Follow the guide thoroughly. Repeat Steps 1-6 if needed.

Why Does Mold Form On My Car Window Seals

Why Does Mold Form On My Car Window Seals

The most important thing in mold elimination is finding out why it’s there in the first place. Mold can’t grow without moisture. So, why are my car window seals moist?

Moisture can come from various sources. For instance, the seals can trap water when the car is washed. When it rains. In cold temperatures, when the cold air reaches hot air from the car, condensation occurs.

All of these cases should not lead to mold growth if the car is dried completely. For instance, if you park your car in a shade after it had rained, the trapped moisture in the seals can’t evaporate.

It’s the same for every example. So, mold forms when there is moisture trapped in the window seals. Usually, the moisture evaporates out in the sun, but it stays there when there’s no sunlight.

Another reason why your car window seals may get mold is the lack of washing. You should regularly wash your car, this minimizes any type of damage that may occur.

Is Mold Dangerous For You

I know some of you may be freaked about the mold you have been inhaling for a while. Don’t panic though. There are a lot of types of mold, the most common one is green mould.

Only black mold is dangerous for humans. However, people with asthma or allergies can have problems with every type of mold.

How To Prevent Mold From Growing On Car Window Seals

  • Don’t park your car in a shade or in a garage after raining or after washing.
  • Don’t store your car in a garage that has mold.
  • Don’t use car covers without breathable fabric.
  • When wet, park your car in direct sunlight.
  • Use vinyl cleaners on the seals, and use vinyl & rubber conditioner.
  • Regularly wash your car.
  • Remove the mold as soon as you notice it, don’t let it grow too much.

The reality is, once you get mold, it’s hard to get rid of it. Not that you won’t be able to clean it off. But most likely, the mold will appear again. That’s why you need to figure out what you were doing wrong. And, always add a conditioner to the rubber seals, a hydrophobic conditioner.

Related Questions And Other FAQs

Is Vaseline Good For Rubber Seals

It depends on the type of vaseline you are using. Petroleum-based products can damage and degrade the rubber. Use Vaseline on the rubber seals only if does not contain petroleum.

Can You Use WD-40 On Rubber Door Seals

Yes, you can use WD-40 on any type of rubber seal, including car window seals. WD-40 is a multi-purpose product that can be used as a lubricant and a rust dissolvent.

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