To clean inkjet paper feed rollers I take a clean sheet of paper, get it started in the manual sheet feed.
Wet a rag with isopropyl alcohol, quickly wipe a stripe in the center of the page and push page feed.
While the page is being drawn into the rollers, grab the trailing edge and resist the feed.
Not so much as to tear the page, just make the rollers slip on the alcohol.
You'll see a dirty smudge where the rollers got scrubbed.
Repeat this, using a new sheet each time, until no smudge.
I've done this on several printers, and 2 sometimes 3 sheets are all you need.
Do Not do this on a laser printer: the alcohol won't help and may catch fire in the fuser.