How Can I Remove Black Spots from My Patio and Driveway?
When you look at your patio or driveway in Oxfordshire, do you see black marks? These stubborn spots are common. If you’re thinking about cleaning them yourself, read on.
What Are Black Spots?
Black marks on patios and driveways are caused by a type of organic growth called black lichen. Lichens are unusual because they are two organisms working together. One part is algae or bacteria, which produces energy through photosynthesis. The other part is fungus, which anchors the lichen to the stone and extracts minerals.
The fungus also sends tiny root-like filaments, known as hyphae, deep into the surface of your paving slabs or blockwork. This makes lichen very difficult to remove.
Why Pressure Washing Doesn’t Work
Using a home pressure washer will only clean surface dirt and grime. It won’t kill the organic growth beneath the stone. As a result, black lichen usually comes back within six months. It also tends to return darker and more visible than before.
Can Shop Products Remove Black Spots?
There are many products available, such as Ultimate Black Spot Remover, Pro Black Spot Remover, and Patio Magic. Most of these contain small amounts of sodium hypochlorite. They may help to lighten the marks, but results are often limited.
How Alfresco Tackles Black Spots
When we clean patios and driveways in Oxfordshire, we always set clear expectations about black lichen. Complete removal in one day is rarely possible.
Our approach begins with a SoftWash pre-treatment. The solution penetrates the surface and kills organic growth at the root. After this, we agitate the stone with a nylon deck scrubber to help lift the growth. Then we use Stonehealth’s DOFF steam system to remove grime, dirt, and much of the lichen.
Sometimes we apply a second round of SoftWash. This contains a biocide that continues to work over time. Black spots usually fade over several weeks or months. For safety, we never apply SoftWash more than twice within 72 hours.
Can Black Spots Be Removed?
The short answer is yes, but not overnight. Patios that have been down for 10 years or more hold deep organic growth. This takes time to die back. In comparison, newer patios or driveways usually respond faster.
Final Word
Black spots are one of the toughest problems in exterior cleaning. However, with the right methods—SoftWash treatment and DOFF steam cleaning—they can be tackled safely. If you want lasting results for your patio or driveway, Alfresco has the expertise and equipment to restore your stone the right way.
