Re: Cleaning Hull in the water
If your boat is small enough, or tender enough, you can do a pretty good job with a regular deck brush with a long handle.
Take a halyard to the next finger over from yours, tie a truckers hitch several feet up - this takes some experimentation - loop the free end through the dock cleat - this is the one place those miserable dock rings actually work better - loop back up through the hitch and heave the boat over.
Cleat or tie it off and go and scrub the exposed side of the boat.
Undo the hitch, take the line to a finger on the other side and repeat.
I could get all but the bottom 1/2 of the fin on my 26' quarter tonner using this technique. A longer handle would have fixed even that.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.