In September 2015, the former Bayer MaterialScience division was renamed Covestro. The company is one of the largest polymer producers in the world and develops materials and solutions for products used in everyday life. Consumers will find these products in, for example, laptops, smartphones, building insulation and medical equipment.

Since the launch of Hamster Cleaning in 2014, Covestro has been a dedicated partner. In various company buildings – ranging from social buildings to offices and manufacturing environments – the ducts are inspected in accordance with the guidelines of EN 15780. The report produced by Hamster Cleaning outlines the current condition of the ventilation system. Following cleaning, the condition of the ducts is monitored annually.