Do you use inexpensive car soap or high end car soap? I think it's crazy that people pay 40-50$ for a gallon of soap. I keep getting tempted to buy Megs. go,d class at costco but then I wonder if it's cheap like kirkland mf towels. I used gold class a long time ago when I started washing my own cars, It was decent nothing special high suds but it didn't feel like it had good lubricity. I think most won't ever use the costco mf towels on their cars but does anyone think they are safe on door jams and wheels?