You must sand the point with wet sand paper. Begin with a fine grit (#400) and go ahead progressively with more fine grained ones until you can´t see the scratches. Next, rub some tooth paste on the canopy and polish it. CAUTION! USE LITTLE PRESSURE TO AVOID BREAKING THE PART!!!! The final step: dip the canopy in Future Floor Polish, wait until it dries, and you will have a "new" canopy. Hope it helps you.
(Excuse my mistakes, I´m not proficient in English.)