Cleaning pens and glass fibre erasers can be used to remove dirt and consumables residues. Glass fibre erasers can be used for instance to erase Indian ink residues from transparent paper or metal templates. Cleaning pens are suitable for precise cleaning of fine mechanical components. Their use enables removal amongst other things of dust, salts, alcohol and grease residues from fibre optic cable connectors. They can also be used for removal of sticky labels or soldering flux. Depending on the field of application, for example isopropyl alcohol, non-flammable solvents or antistatic resins can be used as cleaning agents. Cleaning pens with interchangeable inserts are also suitable for polishing and fine burnishing applications. With glass fibre brush tips of various diameters they can also be used for cleaning the contact surfaces of circuit boards and also for rust removal and for polishing metal parts.