Cleaning One Piece Celluloid Scales?

I got a one piece celluloid scales that I need to clean in between the scales. Can't figure out how to get in there without cracking them in half. Any suggestions or info would be appreciated.

You could try a small nylon bottle brush and use as little pressure as possible, trying not to torque or bend the scales much, or at all.

Thanks I'll try that was thinking pipe cleaners too, but wasn't sure if those would have enough tension to do anything.