Image 1 of 2 Image 2 of 2 Davines OI All In One Milk $39.76 sold out Lightweight OI All In One Milk is a multi-function leave-in spray treatment that softens, detangles, controls frizz and protects the hair from heat. Sold Out Added! Lightweight OI All In One Milk is a multi-function leave-in spray treatment that softens, detangles, controls frizz and protects the hair from heat.