The reason for putting in fridge was because the starch used then would sour overnight if not kept cold. It was the starch made from powder in a box. Most did not iron the same day as wash day, no time. The sprinkling before ironing was to help remove the wrinkles from the rolling. My mother and grandmother had wash day, then ironing day. My job as a little girl was to be sure all the clothepins were taken off the line and put in the clothespin bag. All washing was done with a wringer washer, and it took from morning to noon.