How to Use a Foam Cannon for Car Washing 

 April 6, 2023

By  Mia H.

A foam cannon is a device that attaches to a pressure washer and sprays a thick layer of foam onto a car's surface. The foam helps to loosen and lift dirt, making it easier to wash the car. Using a foam cannon can help to decrease the amount of time and struggle required to wash a car, while also minimizing the risk of scratches and swirl marks. The thick foam also helps to ensure that the soap stays on the car's surface longer, resulting in more thorough cleanliness.

Choosing the Right Foam Cannon for Car Washing

Types of Foam Cannons

There are two main types of foam cannons:

  1. Adjustable
  2. Non-adjustable 


Adjustable foam cannons allow you to control the amount of foam that is sprayed onto the car's surface.

Non-Adjustable Foam Cannons

Non-adjustable foam cannons provide a set amount of foam with each use.

Factors to Consider When Choosing a Foam Cannon

When choosing a foam cannon, consider factors such as the size of your pressure washer, the type of soap you will be using, and the frequency with which you will be washing your car.

How to Use a Foam Cannon for Car Washing

Preparing the Foam Cannon

Before using the foam cannon, make sure it is clean and free of any debris. Attach the foam cannon to your pressure washer and fill it with a mixture of soap and water, following the manufacturer's instructions. 

Mixing the Soap and Water

Use a high-quality car wash soap and mix it with water according to the manufacturer's recommended ratio. Pour the mixture into the foam cannon.

Applying the Foam

Spray the foam onto the car's surface, starting at the top and going to the way down. Cover the entire surface with a thick layer of foam, making sure to get into all the nooks and crannies.

Washing the Car

Using a soft wash mitt or sponge, wash the car's surface, starting at the top and working your way down. Rinse the wash mitt frequently to avoid scratching the car's surface.

Rinsing the Car

Once you have finished washing the car, rinse it thoroughly with clean water, making sure to remove all the soap and foam.

Tips for Using a Foam Cannon for Car Washing

Best Practices for Using a Foam Cannon

  1. Use high-quality car wash soap for the best results.
  2. Always follow the manufacturer's instructions for mixing soap and water and using the foam cannon.
  3. Start at the top of the car and work your way down to avoid dirt and grime from running down onto a previously washed area.
  4. Rinse the car thoroughly with clean water after washing. 

Common Mistakes to Avoid When Using a Foam Cannon

  1. Using too much soap or not enough water in the mixture.
  2. Allowing the foam to dry on the car's surface.
  3. Using a harsh or abrasive wash mitt or sponge. 

Maintenance and Cleaning of a Foam Cannon

  1. After each use, flush the foam cannon with clean water to remove any soap or debris.
  2. Periodically disassemble the foam cannon and clean all the parts with soap and water.


Using a foam cannon for car washing can make the process easier and more effective. Choose the right foam cannon for your needs, follow best practices, and avoid common mistakes for the best results. Using a foam cannon can save time and effort, while also providing better cleanliness for your car. With a little practice and the right equipment, anyone can achieve professional-level results.


You may also like

{"email":"Email address invalid","url":"Website address invalid","required":"Required field missing"}