Window Guys of Tennessee, Brentwood

Jason Nash cleans windows for a living, but his favorite part of his job is the smiles that come afterwards. "[Customers] are amazed most of the time, and it truly makes all the difference when you want your house to look really clean," he says. He should know. He's seen such transformation thousands of times, going all the way back to when he started working at his father's window-cleaning business, which was founded in 1979.

Today, he still follows in those footsteps as the owner of Window Guys of Tennessee, an aptly named organization dedicated to cleaning windows, mirrors, glass furniture, and delicate light fixtures to a streak-free shine.