Deck washes are handy things, you can wash your feet, fish and fishing gear, take a shower after a dip, take the sludge off your anchor before stowing it. But for me as moored 563 owner it would ease the drudgery out of removing the pelican/gull poop that comes with a mooring license.
I priced various DW units on the net and they are not cheap, but the main thing that stopped me buying one was the hassle of fitting it ..power... Fuse...switch..intake line etc. Plus it's pumping salt water
Recently a workmate offers me for sale one of these devices, the fully portable care cube 12v pressure washer. As he could not name a price I finished up swapping sometime I wasn't using for it .
http://www.carcube.com.au
I tried it today for the first time on Spritzig II and it was great. Not exactly a pressure wash but as good as a small mid pressure garden hose. With the nozzle and a hand bristle brush I had the boat scrubbed in about 10 minutes. I know you can use a bucket of salt water for this but spray fresh water cleans the boat quicker and leaves it less sticky. Plus all the other stuff mentioned above will be on the list as well when I take it sailing. It holds enough for about 2 cars or one investigator.
Plus it is completely portable with long hoses and electrical chord so will reach anywhere on the boat . Today I powered it from my jump start power pack as my inboard battery needed a charge but normally it plugs into standard cig lighter.
I will also use it or spraying the tender down on shore after use using the car battery.
Usual disclaimers blah blah blah
