Do you like a "smelly" partner? How do I combat this "smelly, definitely NOT a bed of roses" new teen?

Dazed0N0Confused
My little cousin is 13 and has gotten it in his head he doesn't have to shower, brush his teeth, use deodorant/good smelly products, while I understand that deodorant isn't the main issue, HE HAS TO BRUSH HIS TEETH AND SHOWER, especially since he plays sports. He's handsome too, and always been smooth with the ladies, even in preschool, but it's always been difficult to get him to do hygienic things, like wash his hair.
Besides convincing him that ladies/gentlemen prefer a person who showers and smells good, I'm at a loss. And I'm not sure how to proceed in getting this through his head... He's turned into the older version of the kid, "Frankenstein", from "Big Daddy" staring Adam Sandler... I wish he had Scuba Steve to help him get into the bath at this point.

Please help me. I will be showing him the responses of the MHOs of both girls and guys, and there will be many, I hope, just to prove to him that people don't want to be around you if you're smelly.
Do you like a smelly partner? How do I combat this smelly, definitely NOT a bed of roses new teen?
Do you like a "smelly" partner? How do I combat this "smelly, definitely NOT a bed of roses" new teen?
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