Project Transformation
A newer natural sandstone patio in Marlow with heavy moss, green algae and early black spot, cleaned carefully and protected with Chiltern EverGuard™, followed by a full gutter clean.
BeforeAfterProject at a glance
About the project
The challenge
A relatively new natural stone patio at this Marlow home had already developed heavy moss, green algae and the early signs of black spot. The homeowner wanted more than a short-lived pressure wash: they wanted the paving cleaned carefully and protected against rapid organic regrowth.
Our approach
Chiltern Surface Co completed a controlled patio clean across approximately 28m², treating the black spot and organic contamination before applying Chiltern EverGuard™ for longer-term protection. After seeing the result, the client also asked us to return for a complete gutter clean to the main property and a separate outbuilding.
The result
The clean revealed substantially more of the paving’s natural colour and texture, removed the visible moss, algae and early black spot, and gave the homeowner a longer-term maintenance solution with 12–24 month surface protection.
Step by step
Every project follows a careful, surface-specific process — here’s exactly how we approached this one.
A close inspection of the joints and surface identified established black spot and lichen — a biological problem, not just surface dirt — so the treatment could be matched to it.
Controlled mechanical cleaning lifted the moss, algae and ingrained contamination, bringing back the natural colour of the sandstone.
With the paving clean and dry, Chiltern EverGuard™ was applied to help inhibit the return of moss, algae and black spot for a typical 12–24 months.
Edges and coping details were finished cleanly, leaving a bright, even patio ready to enjoy.
Two very different surfaces in High Wycombe — Indian sandstone entrance steps and a steep block-paved driveway — each given a tailored clean, with the driveway upgraded to polymeric-sand jointing and both protected with Chiltern EverGuard™.
A steep-pitched clay tile roof on an Aylesbury annex, uncleaned for over 30 years, restored with cherry-picker access, controlled low-pressure cleaning, gutter clearance and protection with Chiltern EverGuard™ — revealing a warm terracotta finish.
A natural slate roof in Marlow with heavy moss, algae and lichen, cleaned with a carefully controlled very low-pressure method from scaffolding — no ladders or stand-offs on the fragile slate — and protected with Chiltern EverGuard™.
We'll assess your surfaces and recommend the right approach — no pressure, no obligation.
