I am a washer before sewing person. I do wash fat quarters and even charms. The one thing I have learned the hard way to NOT wash is panels. I did and the squares on it came out wonky, even with trying to iron them straight and square. I have mixed unwashed 2 1/2 inch strips with washed fabrics and had problems wish some bunching up after the first laundering. These were placemats, so not a lot of space to work with to try to fix them. I ended up giving them to my daughter who would love them no matter what.