How do you politely tell someone they smell?

Earlier today, I was ferociously attacked by an odor that an associate exuded-- think of it as the perfect scent for Kanye's homeless look: shower-less, musty with a dangling scent of human excretion.

How do you go about telling someone that?

If I had to deal with them every day, I'd get a group and tell them.

How good of friends are you with them and describe what they look like, their personality, etc.

I can't just give a generic answer, it's a case-by-case basis.

Flat out tell them. I had someone do that to me (I worked in fast food and came to meet them after). It's best to be upfront.

If I can avoid being next to them I take that route. But if I must be by them I tell them they smell like trash.

Pass out

I try to avoid him/her.

I used to sit in front of this guy (at school) whose breath STANK like a filthy bathroom and the strange part is that he breath in breath out like it was cute

American Oxygen.

Throw an odor care package in their bag

But be classy and gift wrap it

Try and move away from the person. That's what I do. Or take small breaths through your nose. Just enough to breathe.

Tell them to scrub it fat.

Basically this

say, you smell like onions and dog ****.

I would be like this gay https://www.youtube.com/watch?v=cSZBae5xou8

We are not really friends, merely associates as highlighted in the op. Occasionally, said individual and I are in the same space and it's not fun for me at least.

Tell them to Focus(now on itunes) on their personal hygiene.

Too much work.

Have you tried spraying febreeze on him?