A revolution in building façade cleaning

The world leading facade cleaning experts

All too often, the façade of a building is left to endure the elements, with building owners and facilities managers opting to look after the interior rather than the exterior.

We have worked on many projects where the buildup of dirt has caused a building’s original materials to become virtually unidentifiable, due most commonly to the 24/7 city lifestyle and the massive pollution created in this environment.

The ultimate facade cleaning system by facade experts Thomann-Hanry®

façade gommage® scaffold-free facade cleaning system was created and developed by facade experts Thomann-Hanry® in Paris. It’s a French term that refers to the process of gently cleaning masonry.

Projected under low pressure from a cabin mounted on a hydraulic boom, ultrafine dry particles flow across all surfaces, gently rubbing away decades of dirt before being drawn off, filtered and collected through a water curtain for recycling. The particles themselves are aluminium silicate – a chemically inert by-product of aluminium smelting; so this revolutionary process starts and ends with recycling, underpinning its impeccable green credentials.

How façade gommage® works

facade cleaning system


Exclusive scaffold-free facade cleaning

The lightweight vacuum cabin can be suspended from outriggers or mounted on a hydraulic boom truck, with no need for costly and unsightly scaffolding.

To ensure consistent quality control, the materials and equipment we use adhere to a uniform standard all over the world – together with other onsite application processes. These procedures assure our clients that every project using façade gommage® will achieve the same impeccable standards.

façade gommage® facade cleaning system can be especially noticeable when applied to large buildings of 500 sq. m. or more. However, many projects have been undertaken on smaller surfaces with the same astounding results.

The boom can reach up to 42m from ground level and smaller machines are available for buildings in narrow streets or with other limited access.

façade gommage® is a bespoke system globally operated by Thomann-Hanry® trained staff with no third-parties involved.

façade gommage® benefits


By gently rubbing dirt away, spectacular results are achieved without collateral damage – a key consideration, especially with older, historic buildings. Unlike water and air-based abrasive techniques which can have a harmful effect, façade gommage® gently rubs masonry, cleaning it with no increase in material roughness. The system provides unrivalled results with detailed stonework such as dentils, cornices, modillions, and statues without damage. The powder is so fine it can clean the smallest of crevices with none of the risks associated with high-pressure water-based systems.

The effectiveness of the process also extends to its remarkable reach. Applied from an agile hydraulic boom, surfaces inaccessible to other techniques are brought easily within range – up to 14 storeys high, as well as narrow and restricted access areas.

Convenience & speed

With no need for scaffolding and up and running within two hours of arrival on site, the process itself achieves blisteringly fast results. Up to 500 sq. m. can be cleaned in one day. When considering a building exterior clean, using a unique system that does not require the use of scaffolding can make the work significantly easier. Business can continue to run, minimising loss of trade, maximising profit potential and maintaining ‘as normal’ day-to-day operations, whatever the business.


As an innovation, the security and safety aspects of façade gommage® set it apart from traditional techniques. At the end of a day’s cleaning, the cabin is simply retracted on its hydraulic boom, leaving building security completely uncompromised. From a Health and Safety perspective, the entire process is contained, unlike DOFF, TORC and nebulous spray techniques, which can inconvenience and potentially endanger passers-by as well as occupants of the building.


Many conventional façade cleaning processes involve blasting accumulated pollutants, grime and residues off the surface of a building, using vast quantities of water with all of the environmental drawbacks that this entails. Using negligible amounts of water, which is continuously recycled through the extraction stage of the process to draw off cleaning residues, no chemicals and not a single pole of scaffolding, façade gommage® is changing the face of façade cleaning entirely. It simply uses a by-product from aluminium smelting – an ultra-fine, inert and non-toxic powder with no chemical properties.

The only requirement of façade gommage® is power and air, which is supplied from the lorry itself.

Learn more about the façade cleaning systems on the market from our façade cleaning guide. The guide offers an in-depth look at the traditional façade cleaning methods. It is an exclusive white paper available for download here.

“Thomann-Hanry®’s façade gommage® system is the perfect solution for cleaning the hotel exteriors. Their unique system meant we were able to clean three elevations, including the main entrance, without disruption to our guests and we were able to keep all our rooms available. The setup and cleaning process is remarkably quick as they do not use scaffold and, most importantly, the results are outstanding.”

Andrew Churchill

Chief Engineer, The Dorchester Hotel

If you are concerned about the façade of your building reflecting poorly on your brand values, contact us to arrange a cleaning sample.

facade cleaning seminar

We offer RIBA-accredited CPD seminars on façade cleaning.

Find out more here.

See the façade gommage® COSHH datasheet

See our façade gommage® projects