I don't mean to be harsh, but there are some expensive realities expected from the owner of a non-trailored boat. Have you factored and budgeted all the expenses related to annual upkeep, seasonal slip/mooring, winter storage, insurance, etc? My summer season slip rental costs more than the 4,000. price of this boat.
If you're concerned about who's paying for pressure washing - sounds to me like you may be getting in over your head. Can you really afford boat ownership?
To answer your last question, the prospective buyer pays the costs related to haul-out, bottom cleaning and the surveyor . . . whom you would be very foolish not to hire.
True Blue . . .
sold the Nauticat