" This might have been any conference room in any bank, except—Rex hadn’t noticed this until he’d been in the room many times—the windows were clean, inside and out, despite being one floor above a busy street. London coal smoke dirtied everything it touched, from laundry to ladies’ gloves to Mayfair mansions.
The result of clean windows, though, was a rare sense of light and freshness within Wentworth and Penrose’s walls. "

― Grace Burrowes , Forever and a Duke (Rogues to Riches, #3)