After finding my CamelBak bladder rust stained from the metal coat hanger I previously used to dry it, I thought there had to be a better way. I thought I remembered a site where somebody modified a plastic coat hanger. I After some searching I found it here: http://www.fightingreality.com/blog/?m=200606. Plastic it definitely a better material, but I thought I could do better.
Step 1: Materials
Sharpie or other marker