However, showing the exhibits openly also involves some drawbacks. Depending on the material the object is made of, acidic, alkaline and hygroscopic dust can do a lot of damage, such as causing metallic objects to corrode. The machines and devices of metal as well as exhibits of wood, textile and plastic showcased at the Technisches Museum therefore need to be checked and dusted on a regular basis.
Museum staff are busy all year cleaning the displayed objects. This is not an easy task, given that many objects are more than 10 metres high or are suspended from the ceiling at a height of 15 metres. The staff are trained in preventive conservation. Apart from taking great care while handling the historical exhibits, they also need some spirit of adventure, for example when it comes to manoeuvring the articulating boom lift to reach large-scale objects.
While cleaning the objects, their general condition is examined as well. If any damage is detected, the Restoration Department is notified to take the necessary stabilisation measures.