If you are anything like me and value your sleep/time in front of Jeremy Kyle then Batiste Dry Shampoo (Blush) should be your new best friend.
Dry Shampoo can be a life-saver as it refreshes oily hair and banishes greasy roots. Batiste Blush has been my favourite for years as it smells lovely, does the job well, and is a snip at around £2 per bottle. I have heard though that some other Batiste bottles (*cough* Boho *cough*) do smell a bit like a dodgy curry, so best stick with Blush.
The dry shampoo comes out white which you then keep brushing through hair until it disappears and absorbs all the grease. As I have platinum blonde highlights, I sometimes use the product to mask regrowing roots and don’t brush it all through; it also has the added benefit of adding volume to the hair which makes it a great product for a night out-dance away girls.