Rear window.

Keeping the window to our back porch clean would be like trying to keep Arthur from eating a piece of candy sitting on the table in front of him. It would be impossible. So we don't try. The back porch window has turned out to be an activity center of sorts. Babies stand up and bang on it (see video), little boys and mamas and papas make faces through it, and 3-year-old fingers get crushed and finger nails eventually fall off (after weeks of a little boy saying, "look at mine finger nail, Papa" as he'd enjoy rocking it back and forth."