I prewash everything including my charms because the chemicals bother my hands. I brush the loose fibers off, then they go into a lingerie bag and into the washer which has had a touch of detergent and some white vinegar added (never had a color bleed). Cold water, gentle cycle. They get transferred to the dryer and then pressed with Magic Sizing. Mostly it's a little frayed edges and a tad off but nothing serious that I can't use and when I work with a five inch tumbler template or such it doesn't matter because the edges are cut off anyway. If there's a wide range of colors I do the darker ones with darker fabrics and the lighter ones in the bag with lighter fabrics. I consider it part of making my project. I mostly cut my own fabrics but some of those charms are so cute... :D