If husband is out in the cold, windy weather today mod-ing the 2363 - see "The Mystery Wire" thread - I should also be doing something for the Sunny, right? So, taking the advice of SOC members in a past thread, I took Clorox Clean-up (actually, the Dollar General knock-off) and Magic Eraser in hand and cleaned the rock guard over our front window. It needed it and I was also hoping to "lighten" some of the yellowing on the fiberglass. I was careful around the decal striping. The results are pictured below: the left side of the guard cleaned twice; the middle once; and the right side not cleaned.
In addition to cold and windy, the Sunny was in the shade, so it's not as clean as it could be. But I was pleased with the results and will do another round when the weather gets a little warmer.