Sandstone cleaning difficulties :
• Bedded and laminated sandstone can contain different types of sand grain which respond differently to cleaning .
• Exposure to pollution and the need for increased cleaning activity can change the porosity of the stone and resistance to weather . Future cleaning cycles are a key consideration .
• More porous types of sandstone can allow staining to travel deeper within the structure and stain if allowed to dwell .
• Deep-rooted atmospheric pollutants or built-up surface pollutants often require multiple methods of cleaning .
• Trying to remove deeper rooted staining to help achieve a uniform finish can lead to overcleaning risks .
The above considerations support the case for a method of sensitive surface cleaning that ’ s agile and open to sensitively working with the surfaces varying pollution levels .
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