Apply grease to the ball and inspect the hitch locking mechanism. The first cleaning of the season is the most important cleaning. Use a cleaner that is designed for what you want to do. If your boat is new, a one-step cleaning product will work fine. Just remember not to let it dry on the surface of the hull.
Proper maintenance dictates taking the batteries out of the boat during the off season.
Wire brush the terminals and fill cells with distilled water. After charging the batteries, check the lights, radio, GPS and other electronic gear that is onboard to make sure all are in good working order. Also inspect the fuse box and make certain extra fuses are on board. Make sure it is charged and securely stowed in a visible place onboard. Inspect distress signal flares for expiration date.