Penetrating oils are great to use before washing your hair because they have water-repelling capabilities. They penetrate the hair shaft when applied to dry hair and prevents hair strands from soaking up lots of water. This is why you'll see them used as pre-poo oil treatments.
Related post: Penetrating Natural Oils for Relaxed Hair
Additionally these three oils have their own unique benefits. Check out the infographic below to see what those benefits are.