Streak-free Outside Window Cleaning

[yottie]

Have been using Stardrops in a bucket of warm water.
Applied with a window brush then squeegeed with a rubber wiper.
The patio windows are quite large and there are always the odd marks left when the sun gets on them.
Is there a better way please.

 

[phatboy]

Half white vinegar, half warm water seems to work for me on a very large fixed window.