What is a good way to tell somebody they stink without hurting their feelings?

I don't wanna hear the usual buy them a gift basket or tell them 2 try a new perfume or something. Some really nice stuff.
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There is no "good" way. But, you can slip it in the conversation with this person. Something like: "..........you know, don't you find it obnoxious that some people do not use deodarant or (do they brush their teeth, or did they take shower or something that bothers you). I wonder what you will do if you meet such a person......? Geesh, some people lack societal norms........." and leave it at that. I bet you bottom dollar that after you move away from that person, he/she will be checking their underarm odor or their breath or whatever you told them.
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