When atmospheric plasma comes in contact with metal or glass, it has a microfine cleaning effect. In this way, even highly sensitive surfaces made of these materials can be completely freed from unwanted contamination. Microfine cleaning with plasma can remove the smallest dust particles from the substrate. Precisely defined surfaces with the best prerequisites for further processing are created thanks to the chemical-physical reaction in the nano range. The microfine cleaning of surfaces prior to bonding, coating, painting or printing thus enables the use of modern solvent-free or water-based systems. Additional pretreatment using chemical primers or mechanical processes, e.g. brushing, can be completely dispensed with. This helps to avoid emissions of VOCs (Volatile Organic Compounds, e.g. hydrocarbons or organic acids) during production. Additionally, the cleaning with atmospheric plasma is a dry process. This offers the great advantage of being able to process all materials immediately —and thus saves a lot of time.