I Just Poured Water on my Scanner
If the scratches are on the glass it could work even better to use a liquid with the same refractive index as the glass. That should make the scratches go away completely.<p>One option is glycerin as can be seen in this video: <a href="https://www.youtube.com/watch?v=pNWCB_GoQA4" rel="nofollow">https://www.youtube.com/watch?v=pNWCB_GoQA4</a> (maybe it only works with pyrex glass ?)<p>Another option is to mix to fluids together, one with a higher index of refraction and one with lower. That way you can tune it to your particular scanner (although I would think most are the same).<p>How you see if your mix has the same refractive index as the glass I haven't figured out yet.