So for the last year I've been using the following method to clean my vinyl.
1. Spray vinyl with aerosol glass cleaner from auto parts store i.e. safelite brand.
2. Take a very soft bristled brush and stroke with the direction of the grooves working in the cleaner careful not to get any on the label.
3. Once both sides are done, rinse with cold water.
4. Lay vinyl on very soft paper towel. The blue ones from auto store. Put another on top of the vinyl and press down to absorb moisture never wiping.
I have not had any problems with this method. Since I made this up and never really asked anyone, what problems do you guys see with me doing this. I'm willing to change my evil ways if someone can convince me.