Ever wear a new pair of jeans straight from the store and notice your hands and shirt turned blue? When dye transfers by friction, it’s called crocking and the indigo dye in blue jeans is a notorious crocker. Before you leave blue everywhere, the washing machine is your first stop. Do a first wash with cold water, before the rinse cycle starts, stop the machine and add two cups white vinegar and let soak for a couple of hours. Then turn the machine back to finish. Hang and air dry your jeans, then press with the hottest iron setting. Then throw them back into the machine for one more cold-water wash.