Power washing can be used to clean brick exterior and interior walls. The power washing machine can be used upto 100 feet away from the structures being cleaned. If not used carefully and within reasonable boundary, pressure water cleaning may damage the masonry. For example, if the Nozzle pressure in an excess of 700 psi it can damage the bricks and erode mortar joints.< blasting is an industrial process where surfaces are treated to make them smooth or rough by spraying a pressured stream of grit to the surface. This treatment has a wide range of industrial applications including; removing contaminants from the surface, polishing and removing rust.
The abrasive substance that is used varies depending on what is being cleaned. and what is happening to it after it has been cleaned. This method of cleaning can be used to remove organic matter (mosses / lichens / algae) from most surfaces, especially brickwork and stonework. The waters heat also helps completely kill the spores of organic matter thus increasing the length of time needed between cleaning. This system is also used to remove paints from stonework and brickwork (in some cases a paint softener will also need to be applied to the surface to assist in removal).
TORC & DOFF Cleaning
The DOFF system (which uses superheated water) is different in action to other systems. It uses ‘superheated’ water which exits the nozzle, in a fan pattern. This method or system uses a water supply method, which then gets to a high pressure unit pump. Here the pressure is increased to the required level before entering the ‘hotbox’. The pressure can be adjusted by the operator and is independent of the temperature setting. Within the heater part, the temperature may increase to 150C just before it passes on through a heat resistant nozzle. This nozzle directs the heated water onto the surface to be cleaned in fan like motion.
TORC systems on the other hand can be applied to remove carbon sulphation stains, lime and cement based paints, bitumen, paint residues, and old oil based paints and lime scales. The TORC system works by creating a gentle swirling vortex whereby a mixture of low air pressure, a little water and safe inert fine granules is used.
When selecting professional cleaning technicians it is important to ensure that not only are they are highly trained, but insured and qualified.