There are a few things you can do to clean Harley Davidson motorcycles. The first is to remove all the oil and grease from the bike. This will help to prevent any build-up and make the bike easier to clean. Next, use a mild soap and water solution to clean the entire bike. Be sure to use a light soap so that you don’t damage the paint or plastic parts of the bike. Finally, dry the bike by using a hairdryer or an oven on high heat. This will remove any excess water and dirt from the motorcycle.