I would recommend a gas powered pressure washer. It is easily movable and you are not restricted by cords. And i never even thought about the possibility of being electrocuted, but now, I would never think of using an electric one just for that reason. Also, I think one with 2000 to 2500 psi would be more then enough. I just rented on with 2500 psi and it did the job perfect.
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