I just found this thread...
You asked for advice, so here you go;
I have a CHEAP electric from Home Depot. 1300 PSI, and it works for me.
I use it to with the fan tip to clean the natural teak during the season. I also use it at home to clean my natural teak patio set, and have done so for the last 4 years. Contrary to what you will read here and elsewhere, it works great at cleaning teak
! I believe that the relatively low pressure is key to not damaging the wood
Looks like this:
(Actually the URL where I found this image has a great discussion on pressure washers. Look here
You need to clean the bottom of your vessel, and I don't think that my dinky little washer is up to that task. However, for quickly washing the cockpit, and the deck, the teak, and clearing the cockpit drains, this thing is the bomb.