For what it's worth, we had one side of our canopy badly affected by
blowing sand. Whenever I am getting ready to fly, I start by cleaning
the canopy with LP Acrylic Polish and finish the job with Sontary
window wipes. The results have been remarkable and visible. Minor
scratches are also diminished. I had purchased both products from
Wings & Wheels ( I have no connection with them, except as a
customer).

Cheers, Charles