Has anyone tried the Novus products? I've used them before, but not on acrylic tanks.
Novus 1 is a nonabrasive cleaner. Novus 2 is a mild abrasive/polish for fine scratch removal. Novus 3 is a more aggresive abrasive/polish for major scratch removal.
I wouldn't use the Novus 3 on acrylic, but if someone has tried Novus 2 on acrylic, I'd be very interested in their results.
I've heard one common use for Novus products is cleaning and removing scratches from acrylic windshields on airplanes. I've used it before in restoring/cleaning collector quality pinball machines.
I've bought them from suppliers on the web and seen them automotive paint stores.