Clean exposed aggregate concrete slabs correctly

On the uneven surfaces of exposed aggregate concrete slabs, dirt tends to settle in the cracks and cavities. When cleaning, the insensitivity of the exposed aggregate concrete helps, which can be processed with a high pressure jet without any problems. Alternatively, scrubbing or brushing is possible. Cleaning agents are rarely required.

Note the spray effect

When cleaning exposed aggregate concrete slabs, you should be more careful with the surroundings than with the slabs themselves. The surface of the exposed aggregate can also be beautified by very powerful hosing down. The high water pressure and the unevenness distribute the hitting water and the dirt transported in it with uncontrolled splashing.

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Before cleaning exposed aggregate concrete slabs with a high-pressure cleaner, consider where the water should not splash. Otherwise, plastered house walls can become so dirty that cleaning is no longer possible. If a spray direction that distributes the water in unwanted directions cannot be avoided, a protective tarpaulin should be considered. A large umbrella or parasol can also provide a helpful splash guard when cleaning.

cleaning supplies

Special stone cleaning agents help with very strong, old and stubborn dirt such as moss and algae. Depending on the type of soiling, the agents are usually acidic and you should therefore pay particular attention to adjacent plants. When using chemical aids, scrubbing or brushing the exposed aggregate concrete slabs is recommended, as the cleaning effect is increased and less cleaning agent has to be used. A splash of lemon juice in the water can also help as a home remedy.

How to clean exposed aggregate concrete slabs

  • water
  • Possibly acidic stone cleaner
  • Possibly joint sand
  • Possibly sealant
  • Brooms with hard bristles
  • Possibly a wire brush
  • Scrubbing brush or scrub brush
  • high pressure cleaner
  • Possibly a broom

1. Sweeping away

Remove coarse dirt and sand by thoroughly sweeping the exposed aggregate concrete slabs. Rooted green growth such as moss can be roughly removed with a wire brush and also brushed off.

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2 Lithofin MN exterior cleaner 2 l - works quickly and thoroughly & gently - nature-... EUR 21.02 Buy from Amazon
3 A.K.B. Stone and Facade Cleaner S Concentrate, 3365 (check for color fastness if colored!), (5... 49.85 EUR Buy from Amazon

2. Water

Generously water the exposed aggregate concrete slabs with a garden hose. After several minutes, the soaking effect helps to loosen the dirt.

3. Scrubbing or brushing

Work plate by plate with a scrubber or brush. Change the working direction at least three times to reach all the indentations and voids.

4th. High pressure cleaning

If you have a high-pressure cleaner at your disposal, use the high-pressure nozzle to spray plate by plate. Special patio cleaning attachments do not develop enough pressure. When using high-pressure cleaners, make sure that you rinse out loose joints made of sand or grit as little as possible.

5. Fill in the joints

If the filling level of your joints has dropped, distribute replacement joint sand after the cleaned exposed aggregate concrete slabs have dried and sweep it in again.

6th. To seal

Finally, you can finish the freshly cleaned exposed aggregate concrete slabs with a sealant that can slow down new soiling. Because the exposed aggregate concrete slabs are insensitive and easy to clean, you can do without them.

Tips & Tricks You can borrow a high-pressure cleaner from hardware stores. You should always first try to clean your exposed aggregate concrete slabs without cleaning agents and only use them when necessary, as the agent seeps into the floor.

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