Coating removal is often also referred to as cleaning. It is a very important and multifaceted process. Coating removal, for example, of old coatings on existing components and structures, such as high buildings and bridges, is performed for the purpose of surface preparation and maintenance with subsequent recoating or even for inspection and examination. Oil and grease residue is removed from items such as vehicle parts, or moulds used for die casting, injection moulding, and glass are cleaned. Welding cinders and other residual welding elements are also removed.