The crucial importance of foam in self-serve car washing bays is right there in the name: foaming brush. Without an adequate supply of thick, cleansing, sudsy foam to properly loosen grit and serve as lubrication, a foaming brush simply cannot do a proper job.

Available in a variety of fill/bristle options, these self-serve brushes work by pumping soapy foam through the handles and out small holes in the brush head. Now imagine a scenario in which the customer uses the brush and just a dribble of foam trickles out, rather than a high lather. What will impress the customer more? What will make the customer feel like he or she is getting a better car wash? What results in a visibly cleaner vehicle?

Given that foaming brushes are the single most important item the customer sees and touches when entering a self-serve, it essentially serves as a calling card for the business and speaks directly to the care and attention to detail the customer will receive.

As such, many self-serve operators are paying more attention to the choice of foaming brush. With an understanding of how important it is to apply more foam, more evenly, self-serve car wash owners can select from the brush options that provide their customers with the best wash possible.

To learn more about the options in foaming brushes, we sat down with Dan Pecora, owner of Erie Brush & Manufacturing, a supplier of car wash brushes and cloth and gentle foam.

Q: Why is the amount of foam produced by the brush important?

A: For self-serve bays, the quality of the wash often depends on providing an adequate quantity of foam. So, it is essential the foaming brush provides enough foam in a continuous flow to cleanse dirt and grit from the brush head to provide a better cleaning.

Without sufficient foam, gritty road debris can remain on car surfaces even if a brush is used, particularly when adhered with dirt or oil. Improperly lubricated foaming brushes can cause problems with the paint.

The problem is that most standard 9-inch foaming brushes have only two to three holes to feed the foam, which often results in an insufficient supply across the brush head. Instead, more holes of greater diameter are actually required to ensure enough foam is available to lubricate the entire brush head.

As a solution, some self-serve foam brushes are designed with proper foam application in mind, resulting in a brush with six foam-feed holes on a typical 9-inch unit.

Q: How important is the choice of fill/bristle of the foaming brush?

A: Less expensive options such as nylon, polyester, and polypropylene filaments may save a few dollars on the front end, but if they scratch the vehicle’s paint are a sure-fire way to lose a customer for life, and even generate negative word-of-mouth. Also, because they are constructed of fewer, shorter, and coarser filaments per brush head, they wear out quickly, bend out of shape, and require frequent replacement.

Soft cloth and gentle foam fill usually comes about 3.5” long, and are good choices for self-serve operations that want to avoid filament brushes. Both are still relatively inexpensive and some people believe they add a nice shine to a car.

However, the top self-serve foaming brush choice remains hog’s hair bristles (2.75” to 5” long). The finer, longer filaments do not scratch andprovide a softer overall wash. Since each hair is tapered, hog’s hair brushes are much softer at the feathered tips for gentle washing, but allow for more rigorous scrubbing when more pressure is applied.

Hog’s hair is also very durable and resilient despite bending and prolonged use. This is due to the hair quickly recovering its natural shape even when bent 90 degrees. In contrast, once traditional brushes are bent, they may remain out of shape and must be replaced. In fact, one hog’s hair brush can outlive two to three less expensive options.

The length and softness of the brush bristles matter as well. Longer, softer bristles not only tend to release grit more easily but also apply the foam more thoroughly across the vehicle.

Q: What other design features in a foaming brush can enhance the cleaning process?

A: To prevent potential marring of the vehicle surface, the brush should be protected with a soft rubber bumper gasket that prevents damage from accidental contact with the vehicle surface.

As for foaming brush handles, longer options enable better reach, but can be more tiring to use. Standard foaming brush handle length is 40”, but could range from 36” to 44”.

Because a slippery, foaming brush grip can make the equipment hard to hold, having a non-slip coating over the entire foaming brush handle to provide a secure grip anywhere is essential.

Adding a handle swivel to the foaming brush also makes it easier to use because it prevents the brush hose from twisting or kinking as well. This inexpensive, sometimes overlooked device makes the foaming brush much easier and less tiring to use so your customer washes their car longer, gets a better wash, and gives you more business.

Jeff Elliott is a Torrance, CA-based technical writer. He has researched and written about industrial technologies and issues for the past 20 years.