I've been wearing a pair of these for the Indigo Invitational for the past 4 months. Loving them and they are just starting to fade noticably and are soft as hell! Can any experienced XHS owner provide me with the best marbling/white lines proof washing method?

I've successfully washed 21oz IH denim many times but this fabric has be intimidated a bit. So far I plan to soak inside out, wash in machine on warm (inside out still) low/no spin, hang dry. Which is my 21oz method minus the pre soaking. Thanks for any tips!