I have used vinegar and water, Windex, and several "house brands" of blue window cleaners and am usually disappointed.
Yesterday I bought a new (to me) one at the Ace hardware store, and I can't stop raving about how wonderfully it works and how sparkling clean the windows are.
It is earth friendly, non-toxic, and "made with no chemicals". I can see using it on many surfaces in the RV from windows to countertops, to the shower and sink.
The last time we washed the side windows in the Alfa they came out cloudy and streaky. I am looking forward to giving this stuff a try.
I have NEVER seen our house windows look this clean and this good. So happy.
We were going to have them done by a professional window cleaner, but the guy our realtor came up with would not do the five big dining room windows. They are too high to reach with a ladder. There is a narrow walk way around them. There are anchor loops on each side of each window to hook onto with a safety harness. When I asked him if he had a harness, he said he wouldn't do anything that required safety equipment. I would not allow anyone out there without, except Craig. He uses a homemade safety belt, but I would not want the liability of having someone fall while using just that. It is more to help him keep his balance and give him confidence.
So we did them ourselves, and they are better than a pro would do!