How can you tell someone they need to wash their clothes?

they need to wash their clothes becuase they smell like a dead animal.. without offending them?

this guy I know wears clothes like this to work, iv actually felt like puking and it disgusts me.

iv hinted around but obviously he's not gonna realize it until it smacks him in the balls.

I've even offered a couple times to wash him a load of clothes and he passes it up
Updates
+1 y
no he's not a coworker he's at my house alot. I'm honestly suprised his manager hasn't said anything becuase I have litterally gagd when he walks by
How can you tell someone they need to wash their clothes?
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