Prewashing all new fabrics before using them to ensure that there will be no uneven shrinkage. It is especially important before quilt makiong to prewash to avoid shrinkage and to ensure there will be no transfer of colours when the quilt is washed.
Wash light coloured fabrics in lukewarm or cold water.
Soak dark coloured fabrics individually in cold water for at least half an hour to set dyes. Machine wash in cold water.