Black spots on a patio are usually caused by lichen, and they're one of the toughest stains to remove. The good news is that with the right products and a bit of patience, your patio can look fresh again without causing unnecessary damage.
Here at Swiss Seal, we're often asked about the best way to remove black spots from patios. Many homeowners try pressure washing alone, only to find the marks remain.
That's because lichen forms deep roots into the surface, so it needs treating properly before it can be removed.
What causes black spots on a patio?
Black spots are most commonly caused by lichen growing on the surface. Lichen thrives in damp conditions and slowly works its way into paving slabs, concrete and natural stone. Unlike ordinary dirt or algae, it forms a strong bond with the surface, making it much harder to remove with water alone.
Over time, these spots become more noticeable and can leave an otherwise clean patio looking tired and neglected.
What is the best black spot treatment for a patio?
A specialist patio black spot remover is the most effective solution. Using a product designed specifically for removing black spots gives the best results. These treatments work to break down the lichen before cleaning, making it much easier to lift away without excessive scrubbing or aggressive pressure washing.
Choosing the right patio black spot remover also helps protect the surface while delivering a deeper clean.
Should you pressure wash black spots?
Pressure washing should be used carefully and only after treatment.
Many people reach straight for the pressure washer, but this often removes surface dirt while leaving the black spots behind.
In some cases, using too much pressure can damage paving, remove jointing sand or even mark softer stones. We always recommend applying a suitable black spot treatment first, then washing the patio once the product has had time to work.
How can you stop black spots coming back?
Regular cleaning and sealing helps prevent future growth.
No patio stays spotless forever, but keeping the surface clean makes it much harder for lichen and algae to establish themselves.
Once the patio has been thoroughly cleaned, applying a quality sealer creates a protective barrier that helps reduce moisture absorption and makes ongoing maintenance much easier.
Which products should you use?
Use cleaners and sealers designed specifically for exterior paving. At Swiss Seal, we supply professional-grade patio cleaning products, patio black spot remover treatments and protective sealers to help restore and protect outdoor surfaces. Using products designed for the job not only gives better results but also helps extend the life of your patio.
Whether you're tackling a small patio or a larger paved area, investing in the right products saves time and delivers a finish that lasts.
Final thoughts
Removing black spots from a patio isn't about working harder - it's about using the right approach. Treat the lichen properly, clean the surface thoroughly and protect it with a quality sealer to keep it looking its best for longer.
If you're looking for reliable patio cleaners, the best black spot treatment for patios or long-lasting patio sealers, we're always happy to help you choose the right products for the job.