Cleaning slat (Wiper blade)

It is located near the fixation of toner unit (specificaly near the heating roller). It causes reminders of toner gathering, which are deposited on the heating roller surface. The heating roller surafce should be clean (there are some types of felt scrapers in printers removing contaminations from surfaces). The oil roller should be replaced on a specific period of printed copies (the most often we exchange it during copier service). Not replacing may cause that printouts are dirty.
Used in laser printers.