I use a plastic barrel with fresh water in it to flush our two-stroke
Mariner outboards. I've searched and read many instructions for
flushing an outboard motor, but to my surprise I have not seen a
single mention about whether the prop should be turning or not.
I would guess that it makes no difference to the flushing quality, and
I reckon it's unnecessary and dangerous to have the motor in gear with
the prop turning while flushing.

Is there anyone out there who thinks the prop should be turning? I ask
only because the people who have been doing the flushing for years do
have it turning, and I know they are going to argue with me.

No I'm not interested in discussing using a garden hose or muffs
thanks.