At Macclandscapes, one question we often get from clients is how to deal with stubborn black marks on patios. These black spots – often caused by lichen or algae – don’t shift easily, even with pressure washing. That’s where ProJoint Black Spot Remover comes in. It’s a product we use ourselves when deep cleaning patios and paving, and it works brilliantly if applied correctly.
Ill explain what this cleaner is, how we use it, what to avoid, and some tips for getting the best results when tackling paving stains.
What Exactly Is ProJoint Black Spot Remover?
ProJoint Black Spot & Algae Remover is a ready-to-use chemical cleaner that’s been designed to tackle some of the most stubborn outdoor marks – including:
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Black spot (lichen)
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Algae
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Moss
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General paving stains
It’s suitable for use on natural stone, concrete, and porcelain paving, so it covers most of the materials we deal with here during our projects.
One of the best things about this cleaner is that you don’t need a pressure washer. The formula contains a bleaching agent that lifts the black spot from the surface and kills off the root growth. That means less physical effort – and a better long-term result.
How We Use ProJoint Black Spot Remover on Paving Jobs
If we’re treating a patio or driveway for black spot, we follow a clear process to get the best results. You can do the same if you’re tackling it yourself at home.
Here’s how to use it:
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Make sure the paving is dry – This product is most effective when the surface is dry and the weather is dry for a few hours ahead.
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Pour or spray the solution directly onto the surface – You don’t need to dilute it. Just apply generously across the affected area.
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Let it sit for around 1 hour – You’ll start to see results as the lichen breaks down and the surface begins to lighten.
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Rinse thoroughly with water – Use a hose and brush to rinse away any loosened debris. No need for a pressure washer.
In most cases, you’ll see a big difference after one treatment. For older patios with deep-rooted black spot, a second application might be needed a few days later.
Tips for Using ProJoint Black Spot Remover Safely
We’re always careful when using chemical cleaners, and we advise the same if you’re planning to do it yourself. Here are our top safety tips:
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Avoid using this near fish ponds – It contains a bleaching agent and is harmful to aquatic life.
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Do not mix with other cleaners – Especially not acid-based products, as this can cause a chemical reaction.
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Keep away from metal fittings – It can damage metal surfaces or fixtures.
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Always wear gloves – Even though it’s user-friendly, it’s still a strong solution.
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Do not use on indoor flooring – It’s for external paving only.
If you’re not sure whether your patio is suitable for treatment, it’s best to ask. We’re happy to assess your space and advise honestly. You can contact us here for help.
Where It Works Best
We find that ProJoint Black Spot Remover works especially well on:
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Sandstone patios that have discoloured over time
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Concrete paving with black algae patches
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Porcelain slabs where moss and lichen cling to textured surfaces
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Driveways with old stains and weathering
It’s ideal for cleaning up outdoor spaces after winter, before selling a home, or just refreshing the look of a tired patio.
Do You Need a Professional to Apply It?
You don’t have to hire a landscaper to use this product – it’s ready to go straight from the bottle and easy to apply. However, in our experience, the results are often better when applied as part of a full clean and aftercare routine.
When we clean a patio, we combine chemical treatments with brushing, rinsing, and other techniques to get a deep, even clean. Plus, we know how to avoid staining or damage, especially on older or delicate stone.
If you’d rather leave it to the experts, just get in touch or give us a call on 07747 561323 and we’ll take care of it for you.
Final Thoughts From Our Team
We’ve used a lot of products over the years, and ProJoint Blackspot Remover is one of the most effective solutions for lichen and algae build-up. It saves time, effort, and repeat cleaning – and it’s especially good on stone patios that have lost their colour due to damp weather.
It’s not a general cleaner – it’s made for serious marks. But when used properly, it restores paving to its best without the need for heavy-duty machinery or constant scrubbing.
If your patio or driveway is looking a little worse for wear, or if black spots are taking over your outdoor space, we’d be glad to help.