The Hondaline shields are polycarbinate, which all have a very hard coating, and I think as that coating deteriorates over the years, that is what makes seeing through them so hard (especially in oncoming sun or headlights at night).
I understand that coating can be buffed off, but it probably requires power tools and a lot of patience.
Google BUFFING OUT POLYCARBINATE WINDSHIELDS, and see what you find. U tube often has the finest how-to's on the planet.
It always comes down to the question.... How much time and effort am I willing to invest, when I can get a new plastic (lucite) shield from ClearView for X dollars? For exactly the same reason, I just replaced both my original polycarb interstate shields last year with ClearViews, and I can tell you it is really nice riding around all day with a crystal clear windshield. (Not counting bugs)
This will get you started.
https://www.youtube.com/results?search_query=buffing+out+polycarbinate+windshields If you do get a ClearView, take the time to get just what you want; height, width, vents, solar tint (barely). Unlike OE, you can get one just perfect for you.