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Pressure Washer Not Dispensing Soap

by Marlon

If you’re concerned about the environment, then you’ll be glad to know that many pressure washers dispense soap automatically.

Some pressure washers come equipped with a special head that sprays soap on the surface being cleaned. Some models are designed to mix water with soap and then spray it onto the surface. Other models have a separate tank for soap, which is mixed with water before spraying.

Regardless of how it’s done, when you use a mobile pressure washer that dispenses soap, you can be sure that your finished job will be cleaner than it would have been if you had just used plain water.

If your soap dispensing machine fails to meet your expectations, there are a lot of things to consider, read on for some of these:

What Causes Pressure Washer Not to Dispense Soap?

If you’re having trouble with your pressure washer not dispensing soap, there are several possible causes:

  • The pump is broken. The most common cause of this problem is that the pump has become stuck or clogged with debris. To fix this, you will need to take apart the pump and clean it out. This should be done by a professional as it requires special tools and knowledge.
  • The soap supply line is clogged. If you have an older model of pressure washer, your soap supply line may have become clogged with debris over time. You can use a small wire brush or similar tool to remove any debris from inside your supply lines. Make sure to check both sides of your hose since they are connected together and often get plugged at both ends simultaneously!

How do You Get the Soap to Work in a Pressure Washer?

Pressure washers are great for cleaning driveways, decks and siding, but if you’re using them to clean cars or other vehicles, you need to use a special type of soap.

The problem with using regular soap is that it doesn’t rinse off easily. It leaves spots and streaks on your vehicle that can take hours to remove with a rag. Special car washing soaps will rinse off quickly and easily, leaving no residue behind.

You can use any type of commercial car wash soap, but if you want something with a little more power and less effort, try using any recommended dish soap as an alternative. It works just as well as other types of car wash soaps and it rinses off easily when you rinse off the vehicle after washing it.

However, the simplest answer is to use warm water. Warm water has more surface tension and adheres better to the surface of an object than cold water does. That’s why you don’t spray cold water on your windshield during winter — it will just bead up and roll off.

Soap works by attaching itself to dirt particles and then lifting them off of surfaces. Cold water doesn’t have enough energy to break down the bonds between soap molecules and dirt particles, so instead they just clump together into tiny balls of suds.

Warm water, on the other hand, has enough energy for these bonds to break down so that the soap can adhere to dirt particles more effectively.


The quick answer is that you need to use the proper soap. There are a few basic types of cleaning solutions used in pressure washers—degreasers, alkaline, and hypochlorite. You’ll want to make sure that you match your cleaning job to the kind of soap you’re using. For your average cleaning jobs around the house, try a degreaser first, then move on to alkaline if you need a stronger chemical to get things done. The bottom line is this—the soap needs time to do its job, just like any other cleaning product. Make sure you give it time for soaking before blasting off your dirt and grime (if it’s not in contact with the contaminants, it can’t do any good). A little patience goes a long way towards effective pressure washing!

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