I would suggest you to go for Turtle Wax - Rinsefree Wash & Wax (from SACO @ SAR 30) as I'm using it and just yesterday found out a good dilution ratio according to my sprayer. My garden sprayer is of 2 ltrs capacity, so I poured about 1.6 oz of rinsefree solution. FYI, I'm using waterless method so I tried this yesterday on my glass surface and it pretty well lubricated it when sprayed on the glass. My towels easily glided over the glass surface without me dragging it and lift of all the dirt.
I will try it on body panels tomorrow, if the weather is good. Because the weather here in Riyadh, is kinda annoying this year. Its a mixture of all of them (Sunny, Windy, Drizzle, Cloudy, Sandy) each day you get up and see one of those.
@bym007
Edit: But right now you are having Megs GC Shampoo, so you try with that, otherwise go for what I mentioned above.