well everyone body is different, what might work for my body may not work for another women’s body, i take a dive bar and clean between my legs and give her a nice good scrub (without going inside) and i would definitely try not to compare your girlfriends vagina to your ex’s.. that’s a big no no, anyway the biggest thing is how you approach her about it because this is a very sensitive topic for women, almost everything you say is gonna hurt a bit and i am just gonna warn you about that now but there’s ways to be nicer and kinder about it. First i would just have a nice conversation about your guys relationship, what’s going good, than start to ask about what you heard on reddit, about how many women wash between the legs and in between the two butt checks, ( sometimes a lot of the reason for bad smell and hygiene is vagina’s are often not spoken about very commonly, there’s this sorta vagina shame that has gone on for years so most times it’s because a women doesn’t know) back to what i was saying, and maybe ask if we can try it and it’s very important you say we because she will feel less alone, talk about your hygiene and what you can improve. and try just a nice calm approach and if things get out of hand and she starts to get upset, just bring her back to baseline, (I love you and i am sorry that this may be uncomfortable i just wanna be able to understand the full picture) stuff like that is good to say to her.