A. While rinsing the boat off is better than just doing nothing, it is still a long way from properly taking care of your investment. You can do a tremendous amount of damage by just rinsing the boat off and not making sure it is properly dried. Hard water spots, if left to build up on a surface such as glass or fiberglass, can dull finishes, ruin glass and be very stubborn to remove, requiring muriatic acid and compound which is no gentle process. If you’re going to rinse the boat great, but make sure you dry it as well. Even using a water softener can cause damage by the minerals left in the water when just exposed to dry in the sun.