I have a cheap bow, I saw on YouTube that you can put rubbing alcohol in a bowl and then take the hair off the stick, only from the frog, dip the hair in the bowl of rubbing alcohol, being careful not to get any on the tip. bathe it carefully in the bowl for a few minutes, then let it dry for about 10min. You’ll notice that the hair is perfectly clean. It will not make any sound on the violin because the rosin is completely removed. Apply rosin and play. You have a clean bow. Any feedback on this Michael? I have not tired this on my expensive bow.