This paticular boat was shipped from Chesapeke Bay, to the Detroit area. It was in the ocean there for three weeks, then plucked out and shipped here. Most of the dirt was road film, and just the start of a water line was forming.
I washed it top to bottom, using a sodium metasilicate based soap, as I was cautious not to damage the gelcoat or stripes on it. Of course I had to brushy brush, and it ended up taking me 2 hours to complete the boat. That boat is about $375,000, and by far the most expensive vehicle I've ever cleaned. And it was fun to do, especially right on the water front. I have no idea what it costs to get lifted out with that sling setup they use.
The water in the background is the Detroit River, and if you take about a 4 mile ride to the south, you empty out into Lake Erie, where there is some excellent walleye fishing. Of course there is also some nice perch and panfish.