We use Jet-Dri for the dishwasher to wash and rinse the outside windows in the house. Believe it would work on the RV as well.
All of the car wash and RV wash products are spot free and should do pretty good as well.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot