Curious who unbuttons shirt collars before washing/drying, who doesn't, and why or why not.
Myself = unbutton per my mother's procedure which I've always followed. It seems to work best as compared to when I occasionally overlook it.
Same for jeans/slacks buttons & zippers. Fasten or nay. Usually I don't fasten but I may do so for dress slacks to avoid zipper abrasion.