Best Patio Cleaner for Black Spots, Algae & Moss (2026 UK Guide)

Keeping your patio clean can dramatically improve the appearance of your garden. However, patios in the UK are constantly exposed to rain, shade and organic growth, which can quickly lead to algae, moss and black spot staining.

If you are searching for the best patio cleaner in 2026, this guide explains what causes patio staining and how to remove it safely and effectively.

What Causes Patios to Turn Green or Black?

Patios often become dirty due to organic growth such as:

• Algae
• Moss
• Black spot lichen
• General organic staining

These problems are especially common in the UK due to damp conditions and shaded areas.

Green staining is usually caused by algae growth, while stubborn black spots are typically lichen, which grows deep inside the pores of stone and paving slabs.

Why Pressure Washing Isn’t Always the Best Solution

Many homeowners try pressure washing first, but this often fails to remove the root cause of staining.

Pressure washing can:

• Remove surface dirt only
• Damage softer stone surfaces
• Remove jointing sand from block paving
• Leave lichen roots behind

This is why professional cleaners often use specialist patio cleaning chemicals instead.

What Makes the Best Patio Cleaner?

A good patio cleaner should:

✔ Remove black spots from patios
✔ Kill algae and moss growth
✔ Work on natural stone and paving slabs
✔ Be safe and easy to apply

Most professional exterior cleaners now rely on chemical patio cleaners rather than pressure washing alone.

The Best Patio Cleaner for 2026

One of the most effective products available is Shark Instant Clean Natural Stone Cleaner.

This cleaner is designed to break down organic growth including:

• Black spot lichen
• Green algae
• Moss and organic staining

Unlike basic patio detergents, it penetrates the stone surface to attack the root of the growth.

This makes it particularly effective for people searching for:

  • patio cleaner for black spots

  • best patio cleaner for algae

  • how to remove black spots from patios

  • professional patio cleaner UK

How to Remove Black Spots from a Patio (Step-by-Step)

1️⃣ Dilute the patio cleaner according to the instructions.
2️⃣ Apply the cleaner evenly across the patio using a sprayer or watering can.
3️⃣ Allow the solution to dwell and break down organic growth.
4️⃣ Lightly brush stubborn areas if required.
5️⃣ Rinse with clean water.

You will often begin to see results quickly, with continued improvement over the following days as the cleaner continues to break down the growth.

Can Patio Cleaners Prevent Algae and Moss?

Regular treatment can significantly reduce the chances of algae and moss returning.

To keep patios cleaner for longer:

• Sweep debris regularly
• Keep shaded areas clear of leaves
• Treat patios periodically with a specialist cleaner

This helps prevent the conditions that allow algae and moss to thrive.

Final Thoughts

Patio staining is extremely common across the UK, but it doesn’t have to be permanent.

Using the right patio cleaner makes a huge difference, especially when dealing with stubborn problems such as black spot lichen or algae growth.

By choosing a professional-grade cleaner and applying it correctly, you can restore the appearance of your patio and keep it looking clean for longer.

Check out Shark Cleaning Chemicals Outdoor Cleaning Range

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