[Turk]

shaps,
I think Windex really is the best choice out there.
I even tried two Professional PPG products.
One you mix with water and use it to clean. The other also diluted with water to condition or to seal.
I managed to make a mess of a small area, that I worked very hard to correct.
I have heard WD-40 being a very good and uniform cleaning agent.
However there is the concern for leaving a oily residue and gathering dust,
You also have to worry about painting it later on with the residue of WD-40 still on the aluminum panels.
Would require thorough cleaning and etching to make it free of all WD-40 prior to paint.

TURK
ps. I loved it while it looked paintless, but I can't take it any more.