Re: dirty uniform
I've had no trouble telling women in our dojo that it's best for them to remove earrings and the like. And anyone who hasn't practiced some basic hygiene gets feedback about it immediately. No drama to it.
Two of our yudansha use the Japanese cotton indigo hakama, which stains other people's gis a lot. We complain, but there really seems to be nothing to do; indigo is like that, even if they try to fix it with vinegar and whatnot. We just wait out the month or so it takes for the staining to stop.