Ya, if possible hosing it down would be the easiest. Just keep it away from any drywall or electrical. In Calif our garage had no drywall and I warped plastic bags around the wall outlets and sealing lights
. Then took the hose and systematically hosed everything down starting with the sealing and rafters. But inside the house I find the easiest way to dust is simply with a bucket of warm water and a towel. The water keeps the dust from becoming airborne and getting all over everything. For the cement floor vacuuming and mopping would work the best, If you cant hose it down.