Wipe the face of the LCD display with a clean edge of a microfiber cloth. Blow off the LCD display's face with a burst of compressed air.
Dip a cotton swab in petroleum jelly. Rotate the swab to cover it liberally in petroleum jelly. Remove excess jelly from the swab by wiping it against the open mouth of the petroleum jelly’s jar.
Place the end of the swab that has the jelly on it just to the left or, if vertical, just above the scratch. Press the swab onto the surface of the LCD display. Swipe the swab across the scratch or, if vertical, down the scratch. Remove the swab once the end of the scratch has been passed. Dispose of the swab in the trash.
Place a clean edge of the microfiber cloth just to the left or, if vertical, just above the scratch. Repeat the procedure just completed with the swab. Blow off the surface of the LCD display with a burst of compressed air.