Sentence:  ... when Mrs. Giddy-gaddy came to take out her clothes, deep green stains appeared on every thing, for she had forgotten the green silk lining of a certain cape, and its color had soaked nicely into the pink and blue gowns, the little chemises, and even the best ruffled petticoat. ... “Lay them on the grass to <WSD>bleach</WSD>,” said Daisy, with an air of experience. 
Meaning of the word marked with <WSD> tags:  To be whitened or lightened (by the sun, for example).