Not easy to handle the action with bib pants, a jacket, zipper, etc. to hand with one hand ;^))).
I guess the can is a good idea. The other, in rough sea and rain is to just use the cockpit floor ;^))). A hand held shower in the cockpit also "helps".
I go below. But I caught one of my crew using the stern rail. I told the guy that I'd prefer he just used the cockpit floor.