Sometime ago I read in a book that that leave-on would be a product that would be left on skin or hair after next wash and that leave-in would be a product that after applied would be rinsed after a few minutes from skin or hair. Does that make any sense? Could you help me understand this? Because people in Brazil use the terms in English but I see there is such a mess around here regardind that subject.
A couple of years ago most people started using leave-in for any product that is not a rinse-off product.