How to clean your concrete slabs

Pollution of concrete slabs on the terrace over time causes algae and moss to settle in the joints. In order to clean the concrete slabs, then usually a lot of effort is needed - but if you proceed as planned, you can keep the work much lower. You can find out how it works here.

Background information

Due to the weather, tiny cracks form on the surface of the concrete blocks in which moss, algae and dirt can accumulate. That makes the terrace very unsightly very quickly. In order to eliminate the pollution, there are various possibilities, but not all are equally effective.

The high-pressure cleaner

Basically, high-pressure cleaners work quite well - but you have to be careful with them. Not all concrete blocks are even suitable for the use of a high-pressure cleaner, and also with other stones, the use of the high-pressure cleaner may leave significant marks on the stones, especially at high pressure.

In addition, the high-pressure cleaner also swirls the joint sand and small stones out of joint, which then heavily pollute the rest of the garden and make it possible to refill the joints. For added detergents you should be careful because of the possibly environmentally harmful effect, and use the high-pressure cleaner only with an attachment.

Chemical cleaners

Home-made recipes such as vinegar cleanser are usually not recommended, but even professional cleaners can damage some stones as well as the surrounding garden, groundwater or pets.

In addition, the manual scrubbing is already a very strenuous task with smaller terraces, and often brings little success. For quick cleaning in between, so as not to let the dirt get too big, it is perfectly suitable, especially if you use special concrete stone cleaners.

Sealing for protection

It is highly recommended to provide the concrete blocks with a suitable seal from the outset, and also to close the joints tightly. In this way, the concrete block is dirt-repellent and the cleaning much easier. The seal should be reapplied every two to three years.

Step-by-step instructions for cleaning the concrete blocks

  • ev. Concrete stone cleaner
  • sealing
  • scouring sand - as fine-grained and sharp-edged as possible
  • fine brooms
  • domestic scrubbers
  • high-pressure cleaner with the highest possible output

1. remove coarse dirt with scouring sand

coarsest dirt You can eliminate it at the beginning by vigorously sweeping over the terrace as fine as possible and as sharp-edged as possible. This has a polishing effect, which breaks up especially dirt crusts and already removed a lot of dirt. The scouring sand method should therefore be at the beginning.

2. Installing the terrace cleaner

To dissolve stubborn dirt, you can apply a professional terrace cleaner and leave it to work. This also has a dirt-dissolving effect. Then you can grab the high-pressure cleaner, if your stones are suitable for it. However, you should be more careful with the detergent added to the high-pressure cleaner.

3. Insert high-pressure cleaner

This requires a bit of patience, as they must proceed slowly, row by row, and keep the beam aimed at a relatively small area. Was already pretreated with stone cleaner, it is a little faster. At the end, push the loosened dirt in front of you to rinse the terrace clean.

4. Sealing

Depending on the package instructions, use a sealant from the hardware store and carefully close the still moist joints with joint plaster, which also prevents weed and moss growth.

Tips & TricksWhen you use high pressure cleaners, you should actually put on a professional device for patio cleaning, rather than the devices for home use. They are much more effective and can sometimes be borrowed.
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