Clothesline
From Futurepedia, the Back to the Future Wiki
A clothesline was commonly used for drying clothes in 1955. After being washed by hand, the clothes were hung outside of the house on cords stretched between two poles and fastened with clothespins. This technique was used before the advent of electric dryers.
George McFly hung his family's clothes on a clothesline in his backyard.
[edit] Behind the scenes
Not only was a clothesline set up in the backyard for this scene, but the grass on the ground was added as well.
