|Stripping them would probably help remove mineral and detergent build-up. Just put them through a 2 or more plain hot water washes (as hot as possible). Adding some water softener would be a good idea, you could also soak in a heavy vinegar concentration prior (the acidity would help dissolve mineral/detergent build-up). A lot of the stains will probably disappear after that since they may well be linked to the mineral build-up. If any remaining stains really bother you, you could try an oxygen bleach (ie Oxy-Clean) to get them out. Oxygen bleach should be fairly safe (especially that it's only once) and is actually recomended by some diaper manufacturers, but it's not recomended by Mother-Ease, just so you know.