Hi there. I saw that you were going to hire a proffessional to acid wash your boat. Do it yourself and save money. I also leave my boat in all season. I use oxalic acid to clean up the hull. You can buy it from homedepo and itīs cheap, mix the oxalic acid in water and put it on the hull, let it sit for awhile and then rinse the dirt off, you maybe have to use a sponge to rub a little bit. The boat will look as new. It is really easy. Use plastic gloves.