Indeed, one could spend the whole day cleaning windows, a temptation I resist.

WSJ: Urban Gardner: The Joy of Clear Glass

Jason Lewis was 26, broke and cleaning windows when he and a college friend decided to embark on an adventure around the world using only human power, one of the last great firsts to conquer.

BBC: Jason Lewis: Circumnavigating the world

Some of the earliest applications of nanomaterials have been in products such as stain-resistant fabrics, self-cleaning windows and harder-wearing tennis balls, but more and more are turning up in cosmetics and skin lotions such as sun-blockers.

ECONOMIST: The dulling of nanotech��s silver lining

Kevin works as a janitor and is responsible for cleaning locker rooms, setting up parties and cleaning the windows around the swimming pool.

FORBES: Six Years On The Job, A Success Story

So, for every window, you're effectively cleaning two windows.

WSJ: Urban Gardner: The Joy of Clear Glass

"You're the second person in the world" who likes cleaning his own windows, Mr. Savadian told me.

WSJ: Urban Gardner: The Joy of Clear Glass

Cleaners usually work for organizations that specialize in one type of cleaning activity, such as washing windows.

CNN: 10 great jobs in nonprofits

My windows in the city open inward for easy cleaning.

WSJ: Urban Gardner: The Joy of Clear Glass