I've got a friend who smells like this. His partner has no sense of smell. Genuinely, medically. I don't know how else she'd be able to live with him, to be honest, let alone find him attractive.
He may have a really poor sense of smell, and have no idea his clothes smell like this. You've got to tell him. It's an easy fix, and it'd be heartbreaking to lose a good bloke over a technicality. Imagine how you'd feel if he turned up and smelled lovely, with a hint of fabric conditioner!
For those saying 'Throw him back..!', it's not an eternal damnation to hard work to say to your partner 'You need to do a hot wash, my love.'
OP, it's much easier to say 'This top you've got on smells a bit weird, darling, did you not get it properly dry before you wore it?' rather than 'You smell, and it's a dealbreaker.' Put the blame on the clothes, and not on him. Work it out like a puzzle between yourselves, culminating in, 'Oh, your clothes smell lovely, darling, give us a kiss!'
No, we shouldn't need to teach our partners how to do their washing, but I'd give him the benefit of the doubt re having a poor sense of smell, given that everything else is great.