How to Get Rid of Dandruff FAST! Dr. Janine shares her tip for how to get rid of dandruff FAST! She talks about discovering this combination by accident when trying to help her son. She mixes castor oil and lemongrass essential oil together and shows how to apply it to the scalp at bedtime. In the morning was hair as normal and the dandruff will be gone. Lastly, Dr. Janine explains how you will likely not need to reapply this mixture for months if at all. Anti-Dandruff Hair Oil Recipe Ingredient