Not all water-fed brushes are the same

> What you need to know about water-fed brushes

> The role played by the material, weight, width, hardness, and the nozzles when it comes to cleaning

> Find the right water-fed brush with the Pure Water configurator

The selection of water-fed brushes on the market is large, but which one is right for your application? clean Magazine discusses the most important differences and gives some helpful tips.

Cleaning dirty glass and façades is at the core of every window and building cleaner's work.
In addition to washers and squeegees, water-fed brushes are one of most commonly used tools of commercial window cleaners. Depending on the application, you have to choose the right brush. This is the only way to ensure a perfect cleaning result.

These four types of brushes are available:

  • Boar hair brushes

Brushes with boar hair made of wild boar bristles deliver the best cleaning power for glass or flat surfaces. The entire length of the bristles are used to do the cleaning, making for more thorough and efficient performance.

  • Radius brushes

Large surfaces can be cleaned even more easily with radius brushes: the angled handle makes it easier to reach the corners of window frames, for example. They are available with either split or unsplit polyester bristles (long lasting and resistant) or yellow unsplit polyester bristles (gentle and effective) especially for the cleaning of solar panels.

  • Rectangular brushes

Rectangular brushes with polyester bristles are durable and with unsplit bristles are especially suitable for windows and flat surfaces.

  • Solar brushes

For cleaning sensitive solar panels, use water-fed brushes with soft split bristles to maximise dirt absorption, while treating the sensitive surface gently.

Practical: All UNGER brushes can be rotated 180° for maximum flexibility and efficiency when cleaning and rinsing different surfaces and working angles. All brushes fit any UNGER nLite rod system.

In addition to the four brush types described, consider the following five criteria when choosing your brush: weight, width, bristle hardness, shape, and nozzle characteristics.

These five criteria will help you make your choice:


  • Depending on the type, a brush can be heavier or lighter. That's why you keep the amount of time you'd be working with the brush when you make your choice. Because the longer you're going to work with a water-fed brush, the lighter it should be.

Brush width:

  • 27 cm: ideal for standard applications.
  • 40 cm: for large windows and surfaces.
  • 60 cm: for special applications such as solar modules.
  • Cleaning with high-pressure water? Then here's a tip: The wider the brush, the more nozzles that can be used.

Bristle hardness:

  • Soft bristles are recommended for normal dirt and sensitive surfaces.
  • Hard bristles are suitable for heavy dirt on less-than-sensitive surfaces.
  • Boar hair bristles have a particularly high cleaning power and are gentle on sensitive surfaces.


  • Rectangular brushes are suitable for standard work.
  • Radius brushes are ideal for large surfaces, frames, and window sills.


  • Each nLite brush comes standard with a pair of jet nozzles.
  • Depending on the brush type, it can be expanded to up to 12 nozzles with quick-release fastener. The number of nozzles used depends on the water pressure: the more water pressure, the more nozzles that can be used simultaneously.
  • Spray nozzles are used for rinsing hydrophobic (water-repellent) glass to apply a kind of water film that wets then drains off larger areas.
  • Jet nozzles are suitable for hydrophilic (water-attracting) glass and help to effectively remove stubborn dirt. They hit limited areas of the surface purposefully and with a lot of pressure to force the dirt off.
  • Depending on the type and size of the surface to be cleaned, you can, for example, combine 2 spray nozzles and 2 jet nozzles.

Tip for more safety: some surfaces are scratch-sensitive. Therefore, test brushes before each use by using them in a less visible location.

Use the Pure Water configurator to find the right brush

Not sure which brush to choose? UNGER provides the Pure Water configurator a practical tool that lets you assemble a complete Pure Water set just for your needs. Which water-fed brushes are you always using? Do you have absolute favourites for specific applications? Then write us in the comment field or via Facebook.

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