RedMaxPro vs Zep
Much has been said about cleaning those streaks and restoring the shine on rigs.
After much research on this site and elsewhere, was convinced that RMP or Zep (same manufacturer) would work. The RedmaxPro was a Lowes house brand manufactured by Zep and the direct replacement is the heavy traffic one by Zep.
I have used the "wetlook" Zep product and am extremely happy with it. All of the accolades, such as better than "sliced bread" are correct. Four to five coats is recommended.
Preparation is 99.9% of the work including the removal PO's application of silicone sealant to seams which collect dirt. The wax goes on easy and even on the first coat when it is still wet, gives a tantalizing hint of what is to come.
As to removing the Zep, they produce a stripper product to do just that.
For procedures to apply, Taxman in his link did just that which he copied from Rv.net.
The additional thing I would recommend is a set of knee pads when you're cleaning the roof. This also gives an opportunity to be up close and personal with those seams that tend to leak.
The other thing to mention is when going over faded graphics is not to linger on them on the first swipe as they may bleed. But once the Zep is on, they're sealed in.
I also used a spray bottle to wet the rag to apply the Zep.