Maybe a lower volume spray, a scrub brush, and a shop-vac. Unless you completely tear the boat appart, you could be scrubbing for weeks.
The approach to the nasty/stinky boat I have is to do a basic scrubbing, targeting places you can see more than the ones you can't. Then starting with the anchor locker area, clean, prep, and paint with porch paint. Then move back one locker at a time. Boat projects always take way longer than you plan. Don't let it take away from sailing time.
I assume you have some basic resources: