Why Bardstown is different
Bardstown has a cleaning problem almost nowhere else has. It is the Bourbon Capital of the World, with Heaven Hill and Barton Brands aging whiskey in town, and the ethanol vapor coming off those warehouses feeds Baudoinia compniacensis, the black whiskey fungus. It can spread around a mile and a half from an aging warehouse and it coats siding, fences, concrete, outdoor furniture and trees in a black crust. Layer that over Kentucky's second oldest city, where 279 structures across 26 blocks of downtown are on the National Register in Georgian and Federal brick, and you have surfaces that are both filthy and delicate.