DOFF cleaning is a professional steam-based method that heats water to about 150 °C and delivers it at very low pressure. The super-heated vapour lifts biological growth, traffic film, graffiti and oil from stone, brick, render and other façade materials while using only ~5 L min-¹ of water, so surfaces dry in minutes and your building fabric remains unharmed.

It is not an acronym. The verb doff appeared in Middle English as a shortened form of “do off,” meaning “to remove.” Its old counterpart don means “to put on.” Stonehealth chose the word for its steam system because that is exactly what the process does: it quietly lifts away decades of dirt and growth, taking them off without a trace.

Yes. The vapor arrives at low pressure, so mortar stays in place, carved detail stays crisp, and walls never become waterlogged. Conservation officers routinely approve the method for Grade I and Grade II sites.

Or process causes very minimal interruptions. The boiler lives in a van, hoses run to the façade, and the lance sounds no louder than a kettle. Entrances stay open, and where footfall is high we put up light barriers to steer passers-by clear of the work zone.

The standard clean relies purely on heat and water. Only when we meet stubborn graffiti shadow or greasy residue do we introduce a biodegradable gel, and even then every trace is captured and removed from site.