That cloudy film in your bathroom has a surprisingly stubborn chemistry behind it — here's what's actually going on. Soap scum is one of those things that most people recognise instantly but rarely think too hard about. It's the dull, whitish-grey film that builds up in bathrooms over time — and if you've ever tried to wipe it away only to find it barely budges, there's a good reason for that. Importantly, it's also something that happens to every bathroom, in every home, re