DOFF is a steam based cleaning system. High temperature and low pressure, capable of heat up to 150 degrees, it is ideal for treating stone. The operator is able to control the temperature and pressure to be appropriate for removing different types of biological matter, paint, algae, moss and general build up of dirt, without damaging a property’s exterior, and without the use of potentially harmful chemicals.

Perfect for revealing the natural colouring of stonework beneath dirt or paint, DOFF is a CADW and English Heritage approved technique, frequently approved for use on listed buildings. Dawson Stone Masonry is fully affiliated with the Stone Federation, along with being approved by Stone Health Ltd for the use of DOFF or TORC Systems.