How to fix copier streaking/lines on copies
If you are running copies using the document feeder (the tray on top of the copier lid), you may sometimes find black lines across your copies. Luckily, this is very easy to fix!
When you lift the lid on the copier, you'll see a narrow strip of glass next to the main scanning area. This is the area the document feeder uses to scan your copies. When this piece of glass gets debris/white out/etc. stuck on it, the scanner sees the debris and translates it into a solid black line across your copy.
Just carefully clean that strip of glass and you'll be able to scan streak-free! There should be lint-free cloths with the copiers you can use to clean the glass without scratching it.