DOFF steam cleaning across the North East

DOFF cleaning is steam cleaning for buildings. The water is heated to a high temperature but delivered at low pressure, so it cleans with heat rather than force. That combination matters on delicate surfaces: the steam kills moss, algae, lichen and fungal growth and releases soiling, while the low pressure leaves soft stone, old brick and historic mortar untouched.

It is the method conservation officers most often point to for listed buildings and period masonry, precisely because it does not erode the surface or drive water into the wall. Because the steam kills growth at the root rather than scraping off the visible layer, results last longer than a plain wash.

Our what is DOFF steam cleaning guide goes into the method in detail. For ordinary stone and brickwork, see stone cleaning and brick cleaning; for a comparison with conventional washing, see steam cleaning vs pressure washing.

Cleaning historic buildings is mostly about restraint. Soft sandstone, lime mortar, decorative carvings and aged brickwork all mark easily, and some are protected by listing conditions that limit what may be done. Steam at low pressure is widely accepted in conservation because it cleans without abrasion and uses no harsh chemistry, so it suits consent requirements. Our listed building cleaning guide covers consent and method.

Moss removal on a listed building is a good example: moss roots into soft mortar, and pulling or blasting it takes the mortar with it. Steam kills the moss in place so it releases without force.

Stone and brick facades with biological growth or general soiling, monuments and memorials, render that cannot take pressure, and any masonry where preserving the surface matters more than speed. It is a slower, more careful method than pressure washing, which is reflected in how such work is planned and quoted.

It is not the right tool for every job. Heavy oil staining on a concrete yard or years of grime on a hard modern surface are pressure washing work, and we will say so plainly if that is what you have. The value of steam is on surfaces that force would damage: soft stone, aged brick, lime mortar and decorative detail.

If you are not sure whether your building needs steam or a simpler wash, describe it or send a photo when you ask for a quote and we will recommend the gentlest method that will actually clean it. We work up to 45 miles from Washington, which covers the great majority of the region's listed and period properties.