I only wash mine when they are obviously dirty, like a stain or something, or when I haven't washed them in a really long time. When I do wash them, I just wash them with the other dark clothes, as in cold water and two caps full of detergent.
Keep in mind, though, I am not a memeber of the working force quite yet, so I really just use/do whatever my mommy supplies.

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Emanuela de Paula - Caroline Trentini - Catherine McNeil
Yep, I'd probably go gay for them.