no- i do not pre-wash pre-cuts= they never come out the same size many times wind up being non-usable- it is better to make the quilt- quilt it- bind it then wash it= cold water with color catchers if you think there may be a bleeder- if the quilts pieces have any deep reds i test them for color fastness- if i have a bleeder i try to replace it with something stable before starting. but pre-cut kits are not put together with the belief you will pre-wash it is not recommended.