When we say “clean,” we’re not talking about your apartment after you’ve scoured it with Pine-Sol. “That’s a more industrial, deodorant clean and, even if you like the scent, there’s a utilitarian quality that will never be truly beautiful,” says fragrance expert Chandler Burr. The clean we’re talking about is more conceptual. “It’s pure luminescence, or light turned somehow into scent,” he says. “New materials, including some terrific fragrance molecules, have allowed scent artists to create them.”