I wash the H3 once a week generally. Sometimes every two. I like to wash the H3 myself so I can get all the road grit and dirt out from those hidden places.
However, if it hasn't been too rainy and I didn't get it filled with sand and mud I will take it to the local carwash.

My car wash is a hand wash, with a very powerful air dry blower that gets most of the water off when it leaves. Then a quick wipe down and off I go.