L'Oréal Paris Elvive Extraordinary Clay Shampoo (£5) is an affordable option specifically made for oily hair with scalp build-up, and it does exactly as it promises: deeply purify roots and hydrate ends. The formula contains kaolin clay, which soaks up excess oils and salicylic acid, which helps exfoliate and rid oil build-up on your scalp.
The formula is silicone-free if that's your bag and is also gentle enough to used on colour-treated hair. What's more if you only have to use a small amount because it lathers so well, making the bottle last a decent amount of time.