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Being a pilot and every windows and windshield in the airplane is Plexiglass, hands down winner in the industry is Plexus.
It was developed especially for the Aviation Industry, but was then markets to motorcycle and Boating Windscreens. Does miracles on Acrylic tanks by filling in the micro scratches.
Obviously I am talking about the outside of the tank here.
Plexus describes a procedure on their can to "help" with hazing. It involves spraying it directly on the area and letting it sit for 30 minutes, washing the area, then reapply. I had limited success with that on airplane windows, but most hazing is bad scratches, so it may not be able to fill it all.
What does work is reapeated applications. Over time the scratches get filled in more and more.