What you will need:
4 drops rosemary oil
4 drops tea tree oil
4 drops lavender oil
What to do:
Put the arrowroot in a blender on a slow setting whilst slowly dropping in each oil then re-blending the mixture.
When complete, decant into an air tight container.
Using approximately one or two teaspoons, brush into your hair with a good quality brush over a surface that can be cleaned of any excess powder that is brushed out of your hair.
If you do not have the ingredients above you can easily just rub a teaspoon or two of cornstarch into your scalp and where your hair is greasy. This should act in the same way as dry shampoos that are on the market.