Anyone know the proper way to clean a camel hair brush? I just acquired a couple of the old brass lipstick-style camel hair lens brushes. Before I put 'em to any of my glass I want to clean them. However, any Google search just brings up how to use a camel hair brush to clean a lens, not how to clean the brush itself. Anyone know? I don't see any dirt/dust, but I'm concerned with anything sticky (like skin oils, etc.) that may be on them.