Introducing the Railcar Denim Laundry Detergent. Railcar often gets asked the best way to wash your Railcar denim, so we 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. Railcar 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 our specialized formulation.