Not All “DOFF Cleaning” Is Genuine DOFF Steam Cleaning

DOFF steam cleaning has become one of the most trusted methods for cleaning brick, stone and heritage surfaces across the UK. It is widely recommended for listed buildings, period homes, churches and sensitive masonry because it combines high temperature with low pressure to remove biological growth safely.

However, not every contractor advertising “DOFF cleaning” is using a genuine Stonehealth DOFF system.

Some companies use modified pressure washers or basic hot water machines and describe them as DOFF cleaning. The equipment may look similar, but the performance, control and safety levels are very different.

If you are responsible for your home, a listed property, a church, or a small commercial building, choosing the wrong system can lead to long-term damage that is expensive — and sometimes impossible — to reverse.

If you would like advice on whether DOFF cleaning is suitable for your property, contact DSW Cleaning for straightforward guidance before committing to any contractor.

What Makes a Genuine DOFF System Different?

A true DOFF system is manufactured by Stonehealth and designed specifically for conservation and delicate masonry cleaning. It works by using very high temperature steam combined with controlled low pressure. The heat kills algae, moss and spores at the root. The low pressure protects mortar joints and surface texture.

This balance is critical.

Standard pressure washing systems rely primarily on force. Even when heated, they often operate at higher PSI levels, which can:

• Erode mortar joints
• Etch brick faces
• Increase surface porosity
• Force water deep into masonry
• Reduce the lifespan of the material

The damage may not always be visible immediately. In many cases, problems only appear months or years later.

For older brickwork, natural stone and lime mortar, this risk is significant.

The Real Risks of Using an Unverified DOFF Contractor

Surface Damage That Cannot Be Reversed

Historic brick and stone cannot simply be replaced without altering the character of the building. Once the face of a brick is removed or mortar joints are weakened, the original fabric is lost.

For listed properties, this may also create conservation concerns.

Short-Term Results, Long-Term Problems

Inferior machines often clean the surface visually but fail to eliminate spores properly. This can result in faster regrowth of algae and staining.

What looked like a cheaper option may need repeating far sooner than expected.

Water Penetration and Damp Issues

Higher pressure and excessive saturation can increase the risk of damp-related problems, particularly in older properties constructed with breathable materials.

A genuine DOFF system is designed to minimise water usage and control moisture levels.

False Economy

When reviewing quotes, it is tempting to focus on price alone. However, the cheapest option can become the most expensive if repairs or repeat cleaning are required.

Protecting brick and stone properly is an investment in the longevity of the building.

If you are comparing quotes and unsure what equipment is being proposed, DSW Cleaning can help you understand the differences clearly.

How to Check If a Contractor Is a Genuine DOFF Specialist

It is entirely reasonable to verify claims before appointing a contractor.

You can ask whether they are a Stonehealth Approved Contractor. This demonstrates formal training in the use of genuine DOFF equipment.

You can ask whether they own a Stonehealth DOFF system rather than a modified pressure washer.

You can ask how they control temperature and pressure during cleaning. A specialist will explain the role of heat rather than simply quoting PSI figures.

You can also request examples of similar properties they have worked on, especially if your home is older or located in a conservation area.

A reputable contractor will welcome these questions.

When Is DOFF Steam Cleaning Recommended?

DOFF cleaning is particularly suitable for:

• Period homes
• Listed buildings
• Churches and heritage properties
• Stone façades
• Victorian and Edwardian brickwork
• Schools and public buildings
• Sensitive residential properties

Because the system focuses on temperature control rather than force, it is widely regarded as one of the safest methods for biological growth removal on delicate masonry.

Why Choosing the Right Contractor Protects Your Property

Cleaning brick and stone is not just about appearance. It directly affects the lifespan of the material. A properly specified DOFF cleaning process can:

• Remove algae and organic staining at the root
• Preserve mortar joints
• Protect surface texture
• Improve presentation without damage
• Deliver longer-lasting results

At DSW Cleaning, we use genuine DOFF systems and take a careful, surface-first approach. We assess the property, consider the material and adjust our method accordingly.

Whether it is a family home, a listed terrace, a church or a small commercial building, our focus is always on safe, effective and responsible cleaning.

Speak to a Trusted DOFF Cleaning Specialist

If you are considering DOFF cleaning for your property and want clarity before making a decision, we are happy to help.

We can explain:

• Whether DOFF is the right method for your building
• What results you can realistically expect
• How our system differs from pressure washing
• What level of care your surface requires

No pressure. No jargon. Just practical advice.

Contact DSW Cleaning today to discuss your project or request a site visit.