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Germany helps clean main gateway of former Hue imperial city
Cam Anh 16:53, 2019/04/23
The gate is one of the best-preserved constructions and was reserved for exclusive use by the Emperor. Today it is the entrance gate for visitors.
After German company Kärcher started cleaning the southern main gateway of the former imperial city of Hue in March 2019 as part of its cultural sponsoring, the handover ceremony of the cleaning project will take place on April 26 in the presence of German Ambassador Christian Berger and representatives of Thua Thien-Hue province.
 
The Northern gateway of the former citadel of Vietnam
The Northern gateway of the former capital of Vietnam
Over decades, the tropical climate, with plenty of rain and high humidity, has led to the original color of the brickwork and the grey limestone being covered in dark organic vegetation that damages the façade in the long term.
Kärcher cleaning experts removed these deposits from the Noon Gate, which was erected in 1804 and is the largest of the four main gates that frame the imperial city. Hue was built by Emperor Gia Long following the model of the Forbidden City in Beijing, and it has been a UNESCO World Heritage Site since 1993.
Cleaning challenges
The country's cultural heritage is of special importance to the people of Vietnam. Thus, a particularly careful and gentle approach is important for the cleaning work, which contributes sustainably to the monument's preservation. A natural ageing process and increasing patina is part of the valuable features of monuments and historical buildings.
"Cleaning does not deprive this monument of its original character, but contributes to ensuring that future generations will also be able to see and experience its beauty," says Thorsten Möwes, cleaning expert at Kärcher, who is responsible for performing the work on site. 
Gentle steam cleaning
To clean the monument, the experts used a gentle steam setting at a surface pressure of 0.5 to 1 bar and a temperature of up to 100°C. Four hot water, high-pressure cleaners generate the steam that removes algae, mosses, fungi, lichens, and bacteria. In this way, absolutely no chemicals are needed. This type of cleaning also delays the growth of new biogenic vegetation, as the steam's high temperature destroys the deeper-seated spores.
"Hot steam cleaning is the most effective, harmless and best method for looking after and preserving the mineral building substance, especially in the tropical Hue. The cleaning of the Noon Gate was a convincing start," says Andrea Teufel, restorer of the Society for the Preservation of Cultural Heritage (CPCE) in Hue.
Hue was the capital of Vietnam during the Nguyen dynasty, which lasted from 1804 to 1945. Most of the buildings were badly damaged during the Vietnam War. The South Gate is one of the best-preserved buildings and was reserved for exclusive use by the Emperor. Today it is the entrance gate for visitors.
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