wear and tear

Alright I've had my boat for two years (07) and its getting some pretty decent wear to it, nothing too bad just the white isn't perfectly white on the seats anymore, and water spots are becoming a slight problem, and things like that. I was just wondering what is typical for boat users, like if we should be cleaning it a lot more or if its normal to have a little wear like that. We do use it quite often (120+hours a season) and we do not have a summer complete shelter we have a large tarp structure it the summer to keep it in shade and away from anything else. In winter we have an indoor shelter.