So my OH had this problem big time when we first met.
He'd been single for years, couldn't smell it on himself, and nobody had ever told him. I imagine colleagues would be something like: big, overweight IT nerd? Of course they all smell (because that's what the internet teaches us, right?).
Anyway, looooonnnng way down the line: ADHD diagnosis, and he's definitely autistic.
Meantime, I switch his deodorants to Mitchum because he's busting through whatever he's using and it ain't working.
Mitchum is a godsend if you use it right.
But using it right isn't putting it on with wet armpits, then putting a shirt straight on before allowing it to dry.
Nor did it deal with his sweaty, rather large body, nor nether regions.
So, lessons were learned: dry body and armpits thoroughly, apply underarm, spray body, wait to dry, dress.
But, as someone upthread pointed out, an ADHD'er won't always have the executive function.
The minute he gets stressed/anxious, many of these little things I've taught him slip away and I have to gently ask: did you forget to dry your armpits this morning?
I'm not joking when I say I had to teach a 38 year old man how to tie his shoelaces. He claims nobody ever taught him. But he also looks surprised when I tell him something I've already mentioned six times before, so I think that's ADHD at work there.
Re: reminders, I should probably keep quiet really, because all it serves to do is make him hate himself even more/the condition he feels unable to control. I had to do it last week because our already shit washing machine in our rental wasn't washing hot, and I don't stand a chance against sweat on a cold wash.
SO. If I had to tell someone like my OH in a meeting, to try to find a way that would cause the least amount of embarrassment and make him hate himself the least, I would start with the usually 'sorry if this is upsetting' and simply say 'I was wondering whether the manufacturer of your deodorant has changed their ingredients lately and it's not working as well as it could for you now?' << tell him you've noticed lots of things have become rubbish on our shelves since the COL crisis.
I mean, it's a bit of a stretch, but it's also not totally implausible. Most food that used to taste good now tastes shit where they've replaced good stuff with cheap ingredients. It's not impossible that some huge bastards like Proctor & Gamble have found a way to cut corners on hygiene and washing products too (I have been unable to find a non-shit washing up liquid for 2+ years, for example).
Anyway, yeah. Lay the blame on the manufactuer's door and the employee has a get out clause to say 'oh my god, that could be it, I'll try something else tomorrow, I'm so sorry.'
I HAVE had deodorants that work fine for me no longer work (Sanex iirc).
And defo do it at the end of the work day and don't parade him/her through an open plan office so everyone knows you've just 'had a word.'
A follow up email is just cruel. Just make a note of the convo and what was agreed and if necessary send to HR for their info only.