When I had problems with the front master cylinder it was leaking fluid and when riding it splattered the face of the gauges. I didn't get it off in time and it etched the face. Tried everything to remove these streaks, mineral spirits, alcohol. As a last resort I used the product shown a fine non abrasive polishing compound, it worked.
I hope this helps someone.
Now I can clearly see just how fast I am going over the speed limit!