Here are the instructions from the American Thread Company booklet on washing and blocking crochet (or knits).
"Using hot water and a mild soap, make thick suds, add cold water until suds are fairly warm.
"Let the article stand in the suds a very few minutes, then squeeze in and out until thoroughly clean. Rinse in clear water several times or until sure the soap is removed. Roll in a bath towel. This will absorb some of the moisture.
"The work is now ready for blocking. Lay the work on a padded ironing board or a flat surface and pin in position with rust-proof pins, stretching it gently to correct size and shape. Press through a damp cloth and leave in position until dry."
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