Cisgenger woman, so please ignore me if this isn't welcome, but I would love to help!
I wash all my bras in the machine, on cold and hang them dry. Putting into a lingerie bag is a personal preference. (I only do it if I'm washing other stuff with zippers) If there are deodorant stains, vinegar is pretty effective. Soak the bra and use either a toothbrush or (I know this sounds crazy) the foam top of a dry-cleaner coat hanger, to scrub off deodorant. Idk why the coat hanger foam works but it's great!
π©΅π©·π€π©·π©΅ If anyone reading this doesn't have a person in their life, who they can reach out to for advice about feminine related stuff, feel free to message me. I'm a professional cosplayer and mortician (so a seamstress, SFX makeup artist, wig stylist, all in one), and I'm happy to share any of my knowledge! My friend group is mostly people who loathe and/or changed their assigned gender, so it's a subject close to my heart. π©΅π©·π€π©·π©΅