Struggling with my partner’s hygiene

My partner (dx) and I live together and while most obstacles we’ve been able to overcome, one we haven’t been able to is the topic of personal hygiene.

I wouldn’t consider myself a huge stickler for hygiene, but I keep myself clean. My partner goes weeks (sometimes up to a month) without showering and brushes their teeth even less. They work a heavy labour job that involves sweating outside in the dirt all day.

Every time I try and broach the subject, they get defensive and mad at me for bringing it up. I understand that it’s embarrassing to have mentioned and I always make sure to do so in private as to not embarrass them but they always end up mad at me and giving me the cold shoulder no matter how I word it. I’ve tried not mentioning it but then they never bathe, I’ve tried giving gentle reminders or trying to set a daily schedule/routine or leaving reminders on the bathroom mirror but nothing works.

Everything ends up with either them mad at me and clean, or not mad and dirty. I love them dearly and I know it isn’t their fault but I can’t just go out in public with them and pretend that people don’t mention their hygiene to me. It’s embarrassing and I don’t know what to do. Any advice would be GREATLY appreciated.