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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 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,...
Patio Black Spots: Why They 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, black spots on paving are colonies of lichen and associated organic growth that have anchored into the microscopic pores of stone, concrete or clay. If the growth is...
