In my everlasting search for a decent cleaning system, years ago I purchased a variation of this RV kit from
Swobbit and have used it for years. They also sell a basic kit for around $150, and they sell the pieces seperately.
The telescoping pole is a must have, as well as the brush and the quick dry water blade.
Since I've moved to a Class A recently, I've found the quick dry water blade to be especially helpful...I use it constantly to squeegie off water from the windows, but when cleaning, it really almost eliminates the need for towels on the entire motorhome to dry cleanly.
When I purchased the kit years ago, I think I paid around $130, so it is pricy, but overall a very well designed, useful product.
I've got another cleaning product to review for you, stay tuned.