Gas with 3000 psi or so will do what you need. It won’t cause damage if you use common sense.

It will come with a selection of spray angle tips. Use a wide one, and don’t get very close. I’ve not seen a gas model that does not have a soap tank.

If you take the time it takes, it takes less time.
--Pat Parelli

American by birth; Alaskan by choice.
--ironbender