Below is an example of some Sandstone ( Yorkstone) that I restored to former glory near West London. As you can see there was allot of mould and growth with years of built up dirt. All of which made the stone look very dull and drab. Our deep cleaning process removes mould very well which allows us to use less pressure in the cleaning washing stage. This prevents damage to the stone.
All pointing was repaired as required and when nice and dry at the end of the job the sandstone was thoroughly saturated in a durable long lasting exterior grade sealer.

Limestone patio tile restoration polishing cleaning and sealing
Below you can see a limestone patio where I deep cleaned and resurfaced the tiles. I first applied mould killing chemicals that allowed a light pressure wash to thoroughly deep clean these limestone patio tiles. After this I was able to resurface with abrasive pads to condition the surface properly. When dry all limestone needs to be thoroughly sealed and buffed.
I can help with exterior tile cleaning all over North London, West London, Bedfordshire, South Buckinghamshire, Hertfordshire, and frequent these areas, Chiswick, St Albans, West Hampstead, Crouch End, Muswell Hill, Barnet, Berkhamsted, Harpenden, Radlett and more..