Chivita, here's my secret: Keep the boat in a garage, under a full canvas cover, and only use it a couple times a year. That way one avoids scratches and wetness, the twin pillars of evil.
More seriously, I guess I just clean it up after every use, and try to avoid the sun. That devilish bit of brightness above can give Bambina skin cancer too, you know. And I always try to be well-fendered before docking, so when the little ship gets tossed, her side rests softly on her pillows.
Scratches keep me from a good night's sleep, and I figure were conceived by a malevolent force to test my conceptions about what is important in life. While the force may not be with me, I think I've found a good psychotherapist. To the rescue comes two products from 3M, one a jug of $18 polish, the other, of course, wax. The polish removes a host of undesirables, and isn't as gritty as more coarse options intended to remove years of sun and neglect. The polish will remove existing wax, making rewax necessary. As always, do the above without rings, zippers, and other metal wearables. Problem is, deeper scratches stay intact. The factory is slated to address a few of mine in August.