Our contractor hired a stainer to prep and stain our log home. The only prep work they did before staining was to powerwash the logs. This left water streaks over ALL the logs which the stainer stained over the top of. I have 2 questions: 1. would corn blasting be the best method to remove these and to start fresh? 2. What is the normal prep work that SHOULD have been done before staining? THANKS!