The term 'pre-poo' is a common abbreviation for 'pre-shampoo.' As the name suggests, it's a crucial step performed before shampooing, designed to protect and nourish your hair. The main goal of a pre-poo is to deeply moisturize and prepare your strands for the shampooing process, which can often strip hair of its natural oils and leave it feeling dry and brittle. This makes it an especially beloved step for those with dry or very dry hair, including relaxed hair, which often needs extra moisture.
A pre-poo can be done in different ways. Most of the time, a pre-poo is characterized by the application of an oil bath. The oil bath consists of one or more vegetable oils and/or butters applied to all the hair. The application is flexible and can be made with any vegetable oil or butter. It is also recommended to apply this oil bath to the scalp to nourish it and prevent dryness during shampooing. Regarding the leave-in time, there isn't a specific one; ideally, it should be left on overnight to optimize oil absorption by the hair. Wearing a plastic cap or a warm towel will also help enhance effectiveness through the action of heat.
an article written by Lady Beauty Swagg - http://ladybeautyswagg.blogspot.fr