I did it after my co wash before my RO. Some people like to leave it in, but I didn't. I like to rinse my hair from the co wash. Apply the ACV, let it soak for a moment then apply my RO on top, comb through to detangle then rinse. It didn't dry my hair at all, and I was amazed at how it perked up.
2C, Medium/Fine, Low Porosity, High Density - CG since 5.19.12
Cowash: Burt's Bee's More Moisture Boabab
[B]Conditioner/LI: Nature's Gate Tea Tree Conditioner - I don't RO
Styling Products: KCCC, KY, Deva Arc AnGel, HESMU