"As a pretreatment before washing my hair, I mix some water with different oils as a pre-poo. And in quarantine, during COVID, I've loved the rice-water mask. I put rice in water and then olive oil, and then the day after, I use it as a pre-poo and rinse with it. You can't do it too much, so I'm wary of that, but It's a very strong protein treatment and some people have sworn by it for hair growth." — Frédérique Harrel, style influencer and founder of RadSwan