Microtek SCANMAKER 4850 Flatbed Scanner "polish scratches glass" Questions

Scratches turned on (hope the site resolution shows the blob. It wouldn't work if there was a feature of the image just where the dust is but it may help and is worth a try. I'd still like to know how

...deep you can polish it out with lots of elbow grease and cigarette ashes. Their are also products n the market to polish scratches out of glass. A really light rubbing compound like for 3M might

the dent caused by the heavy object. take it for a service or just see, if the scratch is above the scanner glass, apply little bit of nail polish remover or de-whitener and rub it with a neat cloth..