Hey Tom (and others following this thread),
It's early yet but I guess I can report on the results of my test as of today. It was 6 weeks ago (or so) that I put a coat of Gel Gloss (one step cleaner and polish) on the roof of our MH. Since that time, I've only had maybe three instances where either rain or dew has run off of the roof, but neither time did I have any milky-colored streaking down the sides of the MH. So I guess I can say that so far the Gel Gloss has worked very nicely for me, better than I expected. We've since left Minnesota and now have the MH in Mesa, AZ so I don't expect a lot or rainfall or dew here either. Needless to say, my roof polishing test is not getting a very good workout.
We ran into heavy rain and a real snowstorm on the trip from Minnesota to Mesa, so I did have to wash the MH when we got here. Once again, I noticed no white streaking from washing, brushing, and rinsing the roof with soap and water. So I guess I can say that so far the results are encouraging.
As for worrying about the roof being too slippery after applying the polish or wax, I can only say that you never need to move around on the area that you just polished or waxed if you do it right. I start at about two feet from the very front and stay in the center of the roof at all times. I sit down in the center of the roof and reach to each side and to the center to apply the polish and to wipe it with a clean rag. I do maybe a 2 square foot area at a time on each side and then do the center areas last. Then I move back a couple of feet and do that area next. I never have to stand on or sit on an area that I just polished. My front cap is the worst because it slopes to the front and has no texture to it at all. This is the one area where I really have to be careful. I never stand in this area and never extend myself too far from the center. If I feel that it's too dangerous to try and reach all the way to the end on either side, I'll get the ladder to do that area from the ground.
After a couple of weeks, the roof won't be too slippery to walk on as that characteristic seems to go away with time.
One thing I have learned from using the Gel Gloss product is that you need to keep using a clean area of the rag to apply the polish. If you use an area of the rag that is even a Little bit dirty, that dirt will be spread over the area that you are applying the polish to and will be much harder to remove when wiping with a clean cloth. Always using a clean area of the rag means that you will have to use more polish, but then if the area you are polishing is already super clean, then your rag will never get dirty anyway and you won't need as much polish to complete the job. But who wants to spend so much time cleaning the rig super clean when you know it'll take even longer to polish it? When washing it, get it clean but not super clean. Then let the Gel Gloss (it's a cleaner too) do it's magic. Just remember to not use a dirty area of the rag to apply the polish, that's my advice FWIW.
