I just hose it off. If you have one of those "power wash" things for cars and such, all the better. They really help to get all the grime off. Don't forget to wash the inside too. Just stick the nozzle through the F holes. All kinds of nasty things can be inside your bass. If you take the end pin out most of the water will drain out the hole. I just hang it by the scroll on the clothes line. Here's where the superiority of a carved bass over a plywood bass becomes apparent. A plywood bass may delaminate from the water leaving a big mess on your driveway but a carved bass will only fall apart at the seams. If that happens just glue it back together but use epoxy resin this time and maybe a couple coats of Varathane to make it more water resistant.