Tannin On Block Paving

How to Remove Tannin Stains from Block Paving

Tannin stains often show up as brown, yellow, or dark marks on block paving, especially near trees or timber features. They can make paving look dirty and old, even though the surface may still be in good condition underneath.

Tannins come from natural sources like leaves, wood, and soil. These stains soak into porous surfaces and resist basic cleaning. With the right cleaner, you can safely remove them and bring your paving back to life.

What Causes Tannin Stains?

Tannins are natural substances found in many plants and trees. Rain or moisture pulls them out, and they stick to surfaces. On block paving, this leads to stubborn staining—especially if the paving isn’t sealed or cleaned quickly.

Here are the main sources of tannin stains:

• Leaves and plant debris – Wet leaves break down and release tannins that stain the surface.
• Timber furniture or decking – Rain can cause tannins in wood to leak and stain the paving below.
• Sap or bark mulch – Tree sap or run-off from wood chips can leave dark patches, especially in wet areas.
• Compost or soil runoff – Nearby garden beds may leak tannin-rich water onto paths or driveways.

Once the stain settles into the paving, water alone won’t clean it.

How to Clean Tannin Stains from Block Paving

Use a tannin remover made for block paving. It works better than regular cleaners and won’t harm the surface.

A quality tannin remover:

✔ Breaks down tannins without needing harsh scrubbing or pressure washing
✔ Protects the surface by using a balanced formula
✔ Works safely on both clay and concrete paving

You might remove the stain with one treatment, but older or heavier stains may need a second go.

How to Prevent Tannin Stains in Future

You can stop tannin stains from forming by keeping the paving clean and sealed. These simple steps help:

✅ Seal your paving – A good sealer blocks tannins from soaking into the surface
✅ Sweep regularly – Keep leaves and debris off your paths to stop staining before it starts
✅ Lift wood furniture – Use rubber pads or plastic feet to keep timber off the ground
✅ Rinse after rain – Wash down the paving if there’s been a storm or heavy leaf fall

Why Not Use Vinegar or Acidic Cleaners?

Household products like vinegar or lemon juice may seem like a quick fix, but they can cause real damage.

Acids can strip colour from the paving or wear away the surface, especially on concrete blocks.

A purpose-made tannin remover is:

✔ Safe to use often without damaging the paving
✔ Free from acids, so it won’t dull or fade colours
✔ Designed to work quickly with little scrubbing or mess

Tannin stains are natural—but you don’t have to live with them. Use a proper tannin cleaner, seal your paving, and clean it often. With the right care, your block paving will stay clean, bright, and looking like new for years to come.