This was an unusual request to clean a large Limestone wall used to mount a sign at a Reading Business Park that had been installed approximately 8 to 10 years prior and never cleaned. The old sign had been removed from the stone which had exposed the unprotected areas of stone leaving a shadow. Pollutants, carbon soils, road dirt and weathering had discoloured the Limestone and the client was unable to get it satisfactorily clean. You can see from the photo below how obviously dirty the stone had become.
Deep Cleaning a Limestone Wall
To get the Limestone cleaned I applied a liberal 50:50 dilution of Tile Doctor Pro-Clean with a roller brush and allowed it to dwell for on the stone for around twenty minutes.
The chemicals got to work on the dirt whilst I set up our truck mounted medium pressure hot water clean and capture system which uses a twin rotary jet system to fire hot water at 90 degrees at 1200psi onto the stone in a circular spinning motion. It’s a great tool that immediately vacuums the waste water away to a separate tank in the van. This mess free clean and capture system is self-contained and doesn’t require the disposal of hot water or dirty water on site either. Using the tool I was able to blast away the soils and pollutants from the stone and then left it to dry.
Sealing the Limestone Wall
When I returned I checked the stone was dry, fortunately it hadn’t rained and the sun and wind had dried it out well. To seal the Limestone I used Tile Doctor Colour Grow which is an impregnating sealer that occupies the pores in the stone to prevent contaminates discolouring it, additionally it’s suitable for internal and external applications and has the added effect of enhancing the natural colour in the stone. Unfortunately I didn’t have time to take a final photograph once it was sealed due to a rather irritating traffic warden.
Source: Commercial Stone and Tile Cleaning in Berkshire
This Polished Limestone floor had been laid in the communal hallway of a block of flats in Aston Clinton and as you can see from the photograph below the stone had become ingrained with dirt over time and was now overdue for a deep clean and polish. Apologies for sounding like a dentist and also the photographs as the lighting wasn’t brilliant in the corridor.
Cleaning Limestone Tile and Grout
Due to the heavy soling of the stone and grout lines we started by applying a strong dilution of Tile Doctor Pro-Clean which is an alkaline cleaning product that’s safe to use on Stone and Grout. The solution was scrubbed into the floor using a commercial rotary machine fitted with a fitted poly brush; once the cleaning solution had become dirty the floor was rinsed with water and the process re-applied until the stone and grout were clean.
Polishing Limestone Floor Tile
Our next task was to re-build the polish on the stone using a set of Tile Doctor Diamond encrusted burnishing pads which are applied to the tile in sequence from Coarse to fine further cleaning and polishing the stone until its returned to its original condition. The pads come in a set of four and you start with the coarse pad together with a little water. This this cuts through and removes surface grime, dirt and any remaining sealer. The floor is then rinsed and you move on through the remaining pads until the polish has been restored to the tiles. This process took up much of the first day so the floor was given a final rinse and left to dry overnight.
Sealing Limestone Tiles
On the second day we returned to find the tiles had dried and we started to seal the Limestone using three coats of Tile Doctor Colour Grow which is a colour intensifying sealer that soaks into the pores of the stone bringing out the natural colours whilst providing that all important lasting protection.
Source: Tile, Stone and Grout Maintenance and Restoration in South-Buckinghamshire