I think it's important to get rid of fabrics that don't feel good or are just not your style. I was gifted a friend's mom's stash. It contained lots of thin polyester blends from the 80's. Pretty colors, just not the quality I wanted today. If I were in your shoes. I would go thru one tote at a time. Look at each piece in the tote and determine if it is your style or not. Then organize by color or type. To me if I want a blue background I like to go to the blue tote. Larger pieces that are good for backs go to the bottom of my bins. I wouldn't worry about washing unless you think it's polyester and you want to check.