My son is a professional window cleaner. He has some very long poles he uses. You might check a strip mall to see who cleans their Windows. If it is an individual, they are usually very reasonable. He does a lot of gas stations and tire shops, so check around.
You need a telescoping pole that reaches up to 25 feet. They are generally available at Ace Hardware stores.
Hi Wendy: I used this product on my friends windows and it worked just fine. It's by Windex and is called Blue Bottle Outdoor Sprayer. Here is the site for it: https://www.homedepot.com/p/Windex-32-fl-oz-Blue-Bottle-Outdoor-Sprayer-305759/202872010 Good luck
I wasn't sure it would work, just spraying it on, but it did! I was really surprised. Clean and streak free:) Just be sure your hose water can reach that far up easily, even if you use a ladder.
Hi Wendy, you could always hire someone for the tallest windows, or maybe try some