The least moisturizing conditioners are the clarifying ones. I personally like the VO5 Kiwi and Lime squeeze, and I know some people like the Suave clarifying conditioner (I haven't tried it bc I can't find it around here). In general citrusy-type conditioners will be more cleansing and less moisturizing, but the VO5 Kiwi/Lime one is the best I've used so far for co-washing.
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Here's all you have to know about men and women: women are crazy, men are stupid. And the main reason women are crazy is that men are stupid. ~ George Carlin