When purchasing clothes, most consumers consult the care labels within the garment, however, care labels tend to be outdated and instruct you that a garment is "Dry Clean Only", when it isn't. With the current technology of washers, the majority of garments can be machine washed and hang or flat dried.
Energy Star estimates that almost 90% of energy used when washing clothes goes to heating water. Only wash as needed. Use front load washers and wash on cold. Using cold water saves 80-90% of energy expended and helps clothes last longer.
Fun fact: You can whiten whites with lemon juice instead of harmful bleach. Add ½ a cup to 1 cup of lemon juice directly on your clothing in the washer during the rinse cycle.