DOFF uses superheated water (150°C) at low pressure, whereas pressure washing uses cold water at high pressure. High pressure can erode soft stone, damage pointing, and force water deep into masonry causing long-term damage. DOFF's gentle approach removes contaminants through heat rather than force, making it safe for delicate heritage stonework, listed buildings, and aged masonry.

DOFF is suitable for all stone types including sandstone, limestone, granite, marble, slate, brick, terracotta, and concrete. It's particularly effective on soft, porous stones that would be damaged by pressure washing. The system is widely used on listed buildings, churches, historic monuments, and period properties across the UK and Ireland.

Yes, DOFF is highly effective at removing paint from masonry surfaces. The superheated steam softens paint layers allowing controlled removal without damaging underlying surfaces. This is ideal for properties where inappropriate modern paint needs removing to restore original appearance, or for preparing surfaces for sympathetic repainting using breathable masonry paints.

Yes, DOFF is approved by Historic Environment Scotland and is the preferred cleaning method for many conservation officers and heritage organizations. It's recognized as one of the safest and most effective systems for cleaning historic and listed buildings. However, you should still obtain necessary permissions from local conservation officers before proceeding with work on listed structures.

DOFF uses only superheated water, making it chemical-free and environmentally friendly. Chemical cleaners can penetrate porous stone, react unpredictably with different minerals, and potentially cause long-term damage or staining. DOFF's mechanical cleaning action through heat and controlled steam is safer for historic materials and doesn't leave chemical residues.

Yes, DOFF is one of the most effective methods for graffiti removal from porous surfaces like brick and stone. The high temperature breaks down paint molecules while the steam lifts them from surface pores, minimizing ghosting or shadowing that often occurs with other removal methods. Results depend on graffiti type, surface porosity, and how quickly removal is performed after vandalism.

Time depends on surface area, contamination severity, and material type. DOFF cleaning is typically slower than pressure washing because it's a more controlled, careful process. For an average residential property facade, expect 1-3 days. Heritage buildings or complex restoration projects may require longer. The extra time ensures safe, damage-free cleaning that preserves your building's historic integrity.

For upper floors or large areas, scaffolding, cherry pickers, or mobile elevated work platforms (MEWPs) are often required for safe access and proper cleaning technique. The DOFF operator needs stable, close access to the surface being cleaned to maintain proper distance and angle. We can advise on access requirements during our initial site survey and arrange appropriate equipment.

DOFF cleaning costs more than standard pressure washing due to specialized equipment, operator expertise, and longer cleaning time. However, for heritage buildings and delicate stonework, it's the only safe option and far less expensive than repairing damage from inappropriate cleaning methods. We provide free site surveys and detailed quotes for all projects, large or small.

Yes, we provide DOFF cleaning services for commercial properties, public buildings, churches, schools, hospitals, and council buildings. We have experience working on listed structures, conservation areas, and heritage sites. All work complies with health and safety requirements, and we can work out-of-hours to minimize disruption. Insurance and method statements provided for all commercial projects.