Flour can replace dry shampoo and provide your hair with profound cleansing when your hair roots look a bit greasy. You can apply flour to your scalp with fingers or dry sponge. Spread 1 tbsp. of flour over the roots and leave it for 5-10 minutes. Brush off the residues with a comb. Flour will come in handy if you have no possibility to wash your hair or when your hair gets greasy too fast.