I made a grave mistake trying to find a shortcut to wash my jumper. Knowing it was knit in superwash, I chucked it in the machine. But I forgot to change it to cold. It went through at 40deg and ... yep ... the dye ran. All those glorious white parts became a mottled golden brown. If it was even, I wouldn't have worried so much. A further 3 attempts at fixing it, didn't work. So I quickly mourned it and cast one a second one! This time in springy/summery colours.