This includes washing two or more balls at a time at each and every tee. A golf ball does not have to be sterilized prior to hitting. The other players must wait until this process is completed, as no one wants to hit with a plunger swooshing in her backswing. And washers are usually positioned near cart paths. This means the offending player not only disturbs the silence with her loading and plunging, but also has ample opportunity to drop balls on the asphalt while drying them.
Misuse of the ball washer can lead to serious injury. The ball washer is a moveable obstruction that can be easily lifted and launched. If you should be impaled by one, seek immediate medical attention.
Quoted from Tuesdays at Eight