18/06/2026
**Is your entrance mat protecting your marble—or quietly ruining it?**
Classic black and white marble pathways are an iconic feature of London's architecture. But at this property on Great Portland Street, a heavy external entrance mat had been trapping moisture, dirt, and organic growth against the stone for years, resulting in severe, deep-set staining.
You can't fix this level of damage with a simple pressure wash. To restore this grand entrance back to its original prestige, our expert stonemasons deployed a highly effective, two-step restoration strategy:
* **Biocide Deep Cleaning:** We applied a specialist biocide treatment to actively break down and eradicate the deep-rooted organic growth and bacteria trapped within the stone's pores.
* **Diamond Refinishing:** We mechanically honed the surface, carefully stripping away the stubborn matting stains and surface wear to reveal the fresh, striking contrast of the black and white marble underneath.
The result is a flawless, welcoming pathway that sets the right tone before you even step through the door.
Don't let hidden stains ruin your property’s curb appeal. Discover our specialist exterior stone restoration services at **[www.mgsrestoration.com](https://www.mgsrestoration.com)**.
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