Welcome aboard, Maine09. Congrats on the new boat! You're going to love it! As for the "little black dots", a pressure washer is your answer. The plastic has little irregularities in the surface that traps dirt, a pressure washer takes them right out. You can also use a "do it yourself" carwash that has the high pressure wands. You can pre-treat the areas with any kind of detergent (I use a cheap version of Liquid Tide) and it will make the dots easier to remove.
Tight lines and let's see some Striper pics.