What is a Pre-Poo? Pre-Poo is a shortened term for Pre-Shampoo. Very simply put, pre-pooing is the process of treating your hair before you shampoo. A Pre-poo is not to be confused with deep conditioning which is normally done after shampooing, pre-poo is a completely separate thing and just because you pre-poo doesn't mean you should skip the deep conditioner.
Why Pre-Poo? The benefits of pre-pooing include increase shine, easier detangling, increased moisturizing and strength. Also, if you use a drying shampoo (something full of sulfates) a pre-poo can sort of prep your hair and help it stand up the shampoo, which means it will be less likely to feel squeaky clean and stripped of all it's moisture.
What should I use? I like to use coconut oil and steam or my favorite conditioner plus steam. You can basically use whatever you want.