And don't wash it in hot water, or run it through the clothes dryer - that can make a stain harder to remove. Wash it in cold water and hang it up to dry (on a hanger in your shower if that works) until you can treat the stain.
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"I believe you find life such a problem because you think there are the good people and the bad people," said the man. "You're wrong, of course. There are, always and only, the bad people, but some of them are on opposite sides."
-- Terry Pratchett, Guards! Guards!