depends on what the "dirt" is and what material the jewelry is made from, but when we do repairs on costume pieces in the shop we take no chances with soap or chemicals. Dampen a paper towel with water and wipe carefully.
SHIT!!!!!!!!!!!!! This is the best thing I have seen YET! I am right up this alley. Oh if I could buy it. Guess I have to make my own, I have some bleached bones lying around... Thank you so much for the inspiration!
The positive/negative is intriguing. How did you treat the first instrument? The second is wrapped in wire I gather, I'd sure like to hear about the materials you used. Not a tutorial, just what it's made from.
PS: using the one bow can be a very powerful message in the world right now.