Ive had to have the conversation with my granddaughter these past few weeks. Luckily she's my granddaughter and I could be pretty blunt
As a girl approaching puberty it was all new to her, and mum hadn't broached it
She told me she sprayed and I explained spraying didn't work, and showed her how to wash at the sink with soap and a cloth if she wasnt showering, then use an antipersperent
But that was family and its a lot easier
I had to have the conversation way back when with a lass at work. A lovely woman, great member of staff, but she stunk
I explained that it wasnt a conversation I wanted to have, but other staff in the office were beginning to voice that they didn't want to be in her team because of her BO . She was aware of some smell, but didn't think it was that bad and as converting to veganism and " natural cruelty free etc products" thought it was an ok trade off .
So we talked though her habits and yes she did wash/shower daily, it was that she had turned her washing down so low - washing clothes in cold water - the sweat wasnt being washed out of her clothes . We got her to a 40oC wash for work clothes - problem solved
This was in the days before washing powder were made to be used in low temps
A lot of people do smell, clothes dried indoors slowly, not washed at a hot enough temp to kill bacteria more so then people who make no attempt to clean themselves. So hygiene is a word that really does need to be avoided, they are probably doing their absolute best but not knowing that a sour smell isnt the norm