“Take two bottles into the shower?” asks one now-classic commercial from the UK. “Not me – I just want to wash my hair and go.” The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

And you can! With a miracle product known as 2-in-1 shampoo and conditioner – but should you? How does it even work? Surely it can’t really replace the talents of the single-function cosmetics?

Well, shore up your cynicism – it’s sillier than you might think.

How do 2-in-1 shampoo and conditioners work?

The whole point of 2-in-1s is that they’re both a shampoo and a conditioner, right? So you might be surprised to learn that, really, that’s not the case. It’s “essentially a shampoo that has added silicones,” explained Paul Wintner, a hairstylist and glo

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