What's a good back wash for a man who has bad acne?

So my boyfriend is a mechanic who has really bad acne on his back and In the summer when he sweats more it's worse so I'm looking for a product that will help him... I'm clueless because I have dermatitis so my skin is so dry I get a zit like once a year so I really need help
What's a good back wash for a man who has bad acne?
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