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If dark spots appear on the concrete pavement, quick action is required. Algae, lichen and fungi can be the cause, but also bird droppings or tire tracks.

preparations

Dark residues on the pavement can be due to various causes and are eliminated with various home remedies. Before treating the stain, you should remove coarse soiling. Sharp-edged sand is an ideal cleaning agent for large paving stones. Spread the substrate over the area with a broom. The fine grains polish the surface and loosen dirt, which is then swept onto a dustpan along with the sand. Therefore, use proper stain removal methods. If the measure does not work, you should try other means and combine different applications. Patience is often required, as deeply burned-in discolorations only fade slowly.

Detergent against tire marks

Residues from car tires are easy to clean because they are superficial and do not penetrate very deeply into the pore structure of the paving stones. Fine traces can be easily removed with an eraser or sponge. Use an environmentally friendly and solvent-free cleaner for stubborn stains:

  • Add biodegradable detergent to water
  • Adjust the amount of detergent to the degree of soiling
  • Pour the solution on the affected areas
  • Work in the agent with a soft brush or sponge
  • leave on for about 20 minutes
  • Rinse the surface with clear water

bleach against lichen

This group of organisms inhabits extreme habitats such as cobblestones that are in both shade and sun. There are lichens that are relatively easy to scrape off with a spatula. Other types require more effort due to intensive cleaning with a wire brush. There are also lichens that penetrate deep into the pores and cannot be removed mechanically. A Bunsen burner helps to kill such stains. In order to make the residues left behind on the concrete paving disappear, the following procedure is recommended:

  • Put hydrogen peroxide on the stains
  • Leave the agent to act so that it decomposes into water and oxygen
  • Thoroughly remove dead lichen with a wire brush

Notice: Pressure washers are not beneficial for lichen and fungal infestations. Thanks to the pore-deep cleaning, moisture penetrates the paving stones, so that organisms settle again after a short time.

Soda against mold

Fungal spores find optimal growth conditions and nutrients on almost any surface. They therefore prefer to settle on shady paving stones. The tiniest deposits of algae or lichens, which decompose naturally, offer the spores a good breeding ground. If the mold has settled in the concrete pavement, it leaves unsightly stains. These are often reminiscent of mold stains in damp laundry and are difficult to remove. By changing the pH, however, you kill the fungal mycelium. In order to reduce unsightly stains in plasters, you should therefore carry out the following measures regularly for at least three months:

  • dissolve five tablespoons of soda in five liters of water
  • Pour onto the affected areas and leave to soak
  • Treat patches thoroughly with a brush
  • Spray down the concrete pavement with a garden hose

Attention: Vinegar is an ideal tool for killing mold. However, use on sealed surfaces outdoors is not permitted.

Baking soda paste against algae growth

Black algae are often responsible for dark discoloration on stones and are therefore often confused with dirt from the road. The organisms prefer to settle on the edges of shaded rocks, as there is a humid microclimate here. If they are not removed in time, the algae growth can spread over a large area. For stubborn stains, this measure has proven its worth:

  • Mix four tablespoons of cornstarch with 100 grams of baking soda
  • add lukewarm water to form a paste
  • Put the agent on the discoloration and leave it on for five hours
  • Scrub concrete pavement thoroughly and rinse off residue with water

Stain remover against bird droppings

Bird droppings often contain dye pigments from berries, which cause blackish discoloration on the plaster. Moisture causes the dyes to penetrate deep into the pores, making the stains more difficult to remove the older you get. As soon as you spot bird droppings, you should remove them with warm water and a few drops of dish soap. Remove stubborn stains with this stone care product:

  • Boil five liters of water
  • Dissolve 50 milliliters of soft soap and 30 grams of washing soda as a cleaning agent
  • Add 30 milliliters of glycerin as a waterproofing agent
  • Mix in 60 grams of commercial stain remover as a dye destroyer

prevent discoloration

Removing stains from concrete paving can be a test of patience. Mechanical measures often affect the concrete pavement, so that the roughened surface offers an improved surface for discolouration. Regular cleaning is recommended to avoid unsightly residues. Clear accumulated fall leaves and fallen fruit from nearby trees. Make sure that there are no puddles on the stones. A dry substrate does not provide an optimal breeding ground for fungi and lichens. Sealing protects the patch from penetrating root systems and color pigments. Smooth surfaces also prevent the growth of various organisms.

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Garden design