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There are no "cleaning sheets" for this unit. Typically when this unit starts leaving marks on printed copies then it is time to do some maintenance on it. By maintenance I mean replacing the imaging drum, the toner and or the developer, all of which can be ordered from this link; Sharp Monochrome Copier Copier Duplicator FREE delivery If you don't feel comfortable then you need to call service!
Open front cover, you will see yellow knob, pull it down and pullout. Wipe the side with mesh with clean cloth and insert back. That's the main charge unit. Pull the green lever to the left and pullout the transfer charger . Wipe the two wires carefully not to break them and insert back.
Do not try to remove the drum if you have no skills otherwise this should solve your problem.
This means the machine is over-toning ie using more toner than required caused by either improper toner or different brand of toner. The correct toner is sf 222T1. Replace developer and use the right toner and clean the drum and its blade. You may need to clean fuser rollers for cleaner copies.
Sounds like a worn drum unit primarily the cleaning blade on the drum is failing. If you don't change it out soon the dirt escaping from the drum and dirty copies will foul-out you fixing unit, = more $$.
You probably have some build up on the glass, which happens if you use the auto feeder most often. Alcohol type cleaner will remove with a very softcloth. One small dot will look like a long streak on a feeder, much like a streaked fax. The other issue is the photoreceptor belt has nicks or is dirty eaither way it needs to be replaced. Try the cleaning first and you may have to look hard for the small dots built up on the glass.