Wash jeans with a cup of white vinegar
Add fabric softener during the rinse cycle
Tumble dry with dryer balls or clean tennis balls
Wear jeans often to break them in
Soak jeans in cold water before the first wear
Put jeans in the freezer overnight
Rub jeans by hand to loosen the fibers
Use a pumice stone lightly on stiff areas
Wash jeans inside out with mild detergent
Avoid over-drying jeans in the dryer