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Black Spots on Patio Slabs: Why Pressure Washing Alone May Not Remove Them
A patio can look brighter after washing yet remain covered in dark speckles. These black spots on patio slabs are often associated with lichen, although other staining can look similar. Identifying the surface and the marks is essential before choosing a treatment. Effective patio black spot removal may require more than another pass with a pressure washer.
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Black Spots and Green Algae
Green algae commonly forms a film across damp, shaded paving. It can make the surface slippery and may lift relatively readily during suitable cleaning. Lichen tends to form more firmly attached patches. Dark marks can remain after surrounding dirt and green growth have been removed, leaving the patio looking uneven despite a noticeable overall improvement. Not every black mark is lichen. Oil, rust-related discolouration and other contamination require a different assessment.
Black Spots on Patio Slabs: Why More Pressure Is Not Always the Answer
Repeatedly increasing pressure to remove black spots from paving slabs can damage the surface without resolving the staining. Vulnerable stone may become etched, while loose pointing or jointing material can be displaced.
Where appropriate, a compatible treatment may help address stubborn organic growth before controlled washing. Product selection, application and rinsing must suit the paving and nearby surroundings. Our patio cleaning service in Kerry begins with an assessment of the surface and visible contamination.
Different Paving Materials Need Different Care
Concrete slabs, natural stone and porcelain should not automatically receive the same treatment. Natural stone varies in porosity and chemical sensitivity. Concrete paving may have a weathered finish that requires care. Porcelain is generally less absorbent, but its joints and surface finish still need consideration.
A small test area can help establish a suitable approach. Existing sealers, damaged joints and previous chemical treatments should also be identified before work starts.
Realistic Results from Black Spot Removal
Professional cleaning can substantially improve a patio’s appearance, but complete removal of every mark cannot be promised. Results depend on the paving, the depth and age of staining, and its previous treatment. Cleaning also cannot reverse physical wear or restore missing jointing. Where a patio connects to other affected outdoor areas, discuss power washing services in Kerry as part of the assessment.
Arrange Patio Black Spot Cleaning in Kerry
Send DNK Cleaning a wide photograph of your patio, close-ups of the spots and your Eircode. Include the paving material, if known, so we can discuss a suitable approach and quotation.