Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
We have a power outlet for the power washer on the washout booth that is wired to a light switch on the side out of water's way. the booth plugs into a GFCI outlet. Works like a charm.
It has a bypass but even then letting it run for too long without using it (more than ten minutes) is bad news.
Pull from a water tank that bypasses back into tank, you can run al day in bypass.
And of course there are some PWs that shut only engage the pump when you pull the trigger ie auto shut off.