2026-01-26
Patio Black Spot Removal in Harrow
Black spot on patios is common in the UK. Learn what causes it, how patio cleaning removes it, and how to keep it away.
If your patio has stubborn dark marks that don't shift, you're probably dealing with black spot—common on UK paving, especially in damp shaded areas.
What causes it?
- Organic growth (lichen/algae)
- Moisture + shade
- Porous stone holding grime over time
Can jet washing remove it?
Jet washing helps, but black spot often needs the correct pre-treatment, dwell time, controlled pressure, and a thorough rinse.
How to prevent it coming back
- Keep patio clear of leaf litter
- Treat early before build-up becomes heavy
- Maintenance cleans help a lot in shaded areas
If you need professional help, view our pressure washing services or see our local pressure washing in Harrow.
Need help in Harrow?
If you want a quote or advice, get in touch — we'll recommend the right approach.