Some research says boiling water, other research and people I know warn against boiling water (too hot, bad for pipes or the glue or something). I am of the opinion to avoid boiling water. I also agree with people who say to avoid harsh chemicals (e.g. draino?) . What remains is a recommendation for copious amounts of baking soda and vinegar, not sure how effective this has been from past experience.
Altogether what is the correct way to maintain bathroom sink drains, keep them clean, avoid mold from soap/toothpaste. I know to avoid letting hair from shaving down them.
My current goal is to minimize mold build up.