Most of us just use common sense to decide when an article of clothing needs to be washed (although some stinky folks could probably use a refresher course), but what does science have to say about when we should wash our clothes?
Allow Greg Foot of Brit Lab to elaborate on the topic of washing clothes, starting with why it's important to wash them in the first place (aka the gross part), and then finishing up the chat by solving the mystery of when we should wash our jeans.
-Via Lifehacker
Underwear, including socks - One wearing
Towels - Every three uses
Pajamas - Every week
Jeans - 6 Months or when they get visibly dirty