Hi<br />I'm new to boating. What I want to do is leave my boat in the water for the summer. What I have found is that the growth that forms is very hard to get off (3 hours with a pressure washer)and has stained the white glass at the waterline. The boat is in fresh water. Is there a paint or coating that will help. How can I remove the stain? How often should I pull the boat for cleaning? Thanks for all the help in advance. 