Well, first, that polycarbonate is curved, coated, and over $900.
The cloudiness is more oxidation of the UV/ scratch restant coating, than actual abrasion, or, at least that's the case on mine.
If you replace it, use Sikafkex 255FC or equivalent, not "urethane windshield adhesive".
First, soap and water wash, then clay bar to clean the pores, then, I use Finesse-it paint polishing compound and a foam bonnet on a buffer. Moderate pressure, moderate speed, and constant moving to keep heat down. If you buff through the coating on the outside, it will cloud and scratch tremendously faster. But, a light buff will work wonders if the coating is intact.
If you find a source with them for less, pleae share, as I could use FIVE of them, 4 on a TB180FR and one on a TB53FR.