The process is a gentle form of steam cleaning used primarily for stonework. The pressure and temperature, with highs of up to 150°C at the nozzle end, is manipulated to remove a wide variety of substances from stonework.

DOFF Cleaning is far more gentle than any other conventional form of steam cleaning. Each minute, five litres of heated water and steam is fed through the hose to the nozzles. The surface does not suffer any damage, saturation or thermal shock as a result of the process.

Over time, stonework will gather moss, algae, fungi and other biological matter which makes the building appear dirty and can cause the brick colour to fade. In order to restore stone to its former glory, DOFF Cleaning is used to clear away foreign substances.

As well as biological matter, the process is also an effective method of cleaning graffiti, wax coatings, oil, bird fouling and chewing gum. On top of being a popular method of cleaning utilised in the building restoration industry, sectors such as food production, transport and medical centres also widely use the steam based cleaner to ensure hygiene standards are maintained.