Stain?
My mother-in-law did cross stitch squares and had a quilt made for each of her great grandchildren. Then had them hand quilted. Somewhere 2 of the ones for my grandchildren got moisture on them. Before we got them, the little blue preprinted dots for quilting lines have bled in a few places. These will be stored for quite some time. Would Synthrapol in a washing machine then pressing gently up and down remove the marks? Would it be ok to spin on gentle?