ᐅ Removing Mold and Lichen from the Terrace

My patio stones (red brick) are now almost 20 years old and have developed many stains from fungi and lichens. I have cleaned them with a pressure washer, but it barely made any difference. How can I remove this unpleasant "patina"?

There are so-called green stain removers that can be used to eliminate organic deposits or dirt. You might want to give that a try.

Hi,

I have also tried quite a few things. Baking powder, vinegar solution, and so on. The results were moderate. Now I received a tip to use a green algae remover. I then bought a 5-liter (1.3 gallons) container from Hornbach. It cost 11.50 CHF back then. I applied it with a brush and let it sit for 2 days. Wonderful, everything is gone.

Hello Marcel,

Thank you for your suggestion. I am experiencing the same problem. I am planning to visit Hornbach next week and hope they have this green algae remover available. The price also seems reasonable.

Yes, the price is reasonable. I got it myself and applied it immediately. The result is excellent — those ugly stains are finally gone. I will now use it regularly.

Hello,

That’s a good tip, as I also need to do something about these ugly stains. Now I have to check if I can find a green algae remover like that at Hornbach. Maybe it’s available at another DIY store as well.

Best regards and have a nice Sunday.