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Why Patio Black Spots Return & How to Stop Them
Why Patio Black Spots Keep Returning Patio black spots keep returning because they are usually not just surface dirt. In most cases, they are colonies of black lichen or deeply embedded organic growth that has rooted into the pores of natural stone, concrete or paving. If the organism is not...
Why Patio Black Spots Return & How to Stop Them
Why Patio Black Spots Keep Returning Patio black spots keep returning because the underlying lichen, algae and organic contamination have not been fully killed or removed from the pores of the paving. Pressure washing often removes the visible surface staining, but black spot lichen can remain rooted into sandstone, limestone,...
