Unfortunately, not the place to go for winterizing your boat. I had to replace my water heater tank (ouch) when I first put my boat in the water because it was not properly winterized and it cracked. Although, I have no doubt not intentional; clearly this business does not back up the work they do; since thy gave no explanation for other causes and they would not back up the work they did. There only response is we did winterize it; there must be another reason, but yet clearly when I showed them the tank it was clear. Very disappointing, I thought I pay $300 to winterize my boat so that this wouldn't happened; now I have to dish out another $300 to replace my tank.