Introducing the Railcar Denim Laundry Detergent. Railcar formulated this detergent to specifically clean and refresh raw denim while minimizing indigo dye bleeding. This formula generates a low amount of suds to make rinsing easier. They included 2 washing methods on the back of the bottle for easy reference and use. Don't risk damaging your jeans using overly harsh industrial detergents! Wash with confidence using this specialized formulation.