Go it alone – and inside out: Turning jeans inside out helps protect the fibers on the outside of the jeans from friction and direct exposure from detergent, which helps prevent fading. ... If you must wash your jeans with other clothes, try to wash them with similarly colored jeans or clothing.
How should you wash jeans?
Set your washing machine to the gentle cycle (or delicate cycle, depending on your machine) and choose the coldest water option. Add a small amount of detergent, then let the cycle run. Air-dry your jeans. Even though it's okay to machine-wash jeans, it's best not to put them in the dryer.
Why do you flip jeans inside out to wash?
An important step that's often overlooked is turning your jeans inside-out before tossing them in the washing machine. Flipping your jeans allows the dirtiest side of them to get the most exposure to the soapy water. It also protects the outside of the jeans from getting worn out by the machine's agitation.