After a winter up a muddy creek “Elektra” was coated with a layer of mud below the water line, I had worked out a way of using my pressure washer with a header tank filled from the stream but found out my petrol gen would not run the p-washer so had to revert to scrubbing. I had made up duck boards to keep me out of the mud only to discover I would not fit under the boat between the bilge keels if I used them! So use a plywood sheet instead.
I scrubbed off one day and anti-fouled “Elektra” the next, it was the first time I had ever anti-fouled in oilers, having done the job once I have now decided to do it in the summer next year on a clean beach!