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How to Remove Mildew from Outdoor Cushions [5 Solutions]

Mildews are extremely disgusting. It is a type of fungus that causes a lot of skin diseases. You might have seen mildew on the couch you left outside. So, do you want them to remain on your cushions? I bet now you are concerned about it. 

How to remove mildew from outdoor cushions?

Well, there are a lot of ways to remove mildew from cushions. Although, using the right tool for the right method is important. You can use borax, a pressure washer, dish soaps, bleaching powder, or acid to remove mildew from the cushions in your backyard.

Each of the removals has multiple steps. To learn them properly, dive down below. I got this whole article about methods of removing mildews. 

5 Easy Methods to Remove Mildew from Outdoor Cushions

You can clean mildew from cushions using different tools. The tool you’ll be needing is widely available. I have mentioned below the methods, required tools, and the steps you need to follow. 

1. Borax Method 

This is the easiest and quickest way to clean mildews. It also doesn’t require too much effort and skill. Here is a detailed idea about this method.

Tools you’ll be needing

  • Bucket
  • Borax
  • Dish soap
  • Brush
  • Gloves 


  1. Soak the cushions on water.
  2. In the bucket put 1 cup of borax and 2 teaspoons of dish soap. Mix with a full bucket of water.
  3. Use the solution on the cushions and scrub the affected areas.
  4. Leave the cushions for five minutes. When the time is over, rinse it with water. 

2. Pressured Water Method

This is the simplest way to clean mildews from one cushion sofa or any type of cushions. If you own a pressure washer you don’t need any extra tools here. You can also rent one if you don’t have the tool.

If you need to remove mildew almost regularly, a better option is to purchase a pressure washer. Here are 2 suggestions from me for you:


Both of the products are highly popular. But you must have to use them in a certain way to get the best performance and make them last longer. Let’s get back to the method.

Things you’ll be needing

  • Pressure washer
  • Brush
  • Soap (not mandatory) 


  1. Set your pressure washer at the lowest PSI
  2. Lay your cushions flat on the ground 
  3. Now clean the cushions by sweeping horizontally 
  4. If you’re using soap. Rise after cleaning with soap

3. Dish Soap Method

We all have dish soap laying around in our house. It can also clean molds of mildews. But this is not the most effective way. If the mildews have spread a lot, use other methods. 

Things you’ll be needing

  • A quarter cup of dish soap
  • Brush
  • Bucket 


  1. Brush the excess dirt before applying soap
  2. Soak the cushions and apply the dish soap
  3. Brush the molded areas
  4. Rinse with water and dry

Remember, this is not the most effective method. Do it if the mold has not spread much. 

4. Bleaching Method

Bleach is a very powerful product. It can clean mildew, mold, stain, and even green pools. But the thing you should be aware of, bleach can take the color off. Bleach is best to use on white cushions. 

Use protective materials. Bleach can be harmful on skins.

Things you’ll be needing

  • 3 quarter cups of bleach
  • 1 gallon of water
  • Bucket
  • Brush
  • Gloves 


  1. Mix the bleach with a 1-gallon water
  2. Soak the cushion in the solution for 5 minutes (max)
  3. Brush the areas where the mildews were. Or where the stains are
  4. Rise with water carefully

5. Acid Method

Acid is another effective product. It is used for cleaning different things such as stains, concrete, mildew, etc. But acid is dangerous for our skin. You must remember to wear gloves while working with acids. If you don’t want to take risks you can use lemon juice or vinegar.

Things you’ll be needing

  • Distilled white vinegar
  • Dish soap
  • Bowl
  • Sponge 
  • Spray bottle


  1. Fill the spray bottle with 50/50 water and vinegar
  2. Spray on the molded areas on the cushion
  3. Let it sit for 10 minutes
  4. Rinse with water and do the same step again

If the cushion covers are removable. Then put it in the washing machine with the solution. This is the most effective way with vinegar.

There are a lot of ways to clean mildew. But these are the easiest and the most effective methods to clean mildew. 

How to Prevent Mildew from Growing on My Outdoor Cushions

Though mildew doesn’t cause damage it is wise to remove them. The best thing to do is prevent mildew in the first place. 

The mentioned methods prevent mildews. But you have to keep it as a process. Molds appear whenever there is too much moisture in the air. Using a dehumidifier is a great option indoors. But there is no permanent way to prevent molding.

Keeping your cushions clean is the best thing you can do. Having removable cushion covers can come in handy. Since removable cushion covers can be cleaned easily.

Make sure there is enough ventilation. A damp cushion can cause mold. Keep the cushion covers under the sunlight often. This can prevent mold or mildew as well. 


Question: Where can I get borax and bleach?

Answer: Nowadays online is the easiest option to get anything. But borax and bleach can be available in your local grocery store. 

Question: Are cushions repairable?

Answer: If a cushion has too much mold or mildew then it is. It can be hard to remove all the stains and fungus. At that point, it’s better to get a new one. 

Question: How to remove mildew stains?

Answer: Mildew stains can be removed if you follow the above steps. Brush them out with dish soap. Use a soft brush.


So that’s all from my side on the topic about how to remove mildew from outdoor cushions. I hope I’ve cleared all your confusion.

Here is one warning for you. Borax is a mineral salt and it can be sensitive to skin. Be careful with acid too. 

So, now it’s your turn to select one method and give it a try.