Use a pencil eraser gently on light ink marks
Apply a small amount of rubbing alcohol with a cotton swab
Dab the area with a cotton swab dipped in acetone-free nail polish remover
Use a correction pen or correction tape to cover the ink
Apply a small amount of lemon juice with a cotton swab
Lightly scrape the surface with a razor blade on thick paper
Use fine-grit sandpaper very carefully on sturdy paper
Cover the mark with white correction fluid
Scan or photocopy the page and edit the image digitally
Rewrite or print a clean copy of the page