The Skingredients PreProbiotic Cleanse (£23) is the brand's everyday cleanser. It washes away dirt and grime and removes your makeup, all whilst keeping your skin barrier happy and healthy. "Because it's topical, the pre- and probiotics can't actually have an impact on your bacteria. We use it more as an analogy and to fit into our dinner-plate analogy; we know that good bacteria is good for our insides as they're anti-inflammatory and soothing, and that's the premise of PrePro," explained Rock. "We're not trying to claim that it is the pre- and the probiotics. I personally haven't seen — and our chemists haven't seen — any data that says that topical pre- and probiotics will have an impact on your microbiome. But I do believe and respect the microbiome, and that's what the PrePro cleanser does."