First I decided to clean one pane of my patio doors but not the other, to see if I could tell the difference between the two. I could. The problem with windows is that it is often difficult to tell if a mark is indoors, or outdoors. So I cleaned the large bathroom mirror with the spray. It did a fine job. For my final test I cleaned my spectacles, and the spray worked better than the spectacle wipes I usually use. So this product does what it says on the tin.
Used all around the house on windows, mirrors, steel and work surfaces. Very effective, even better than the big brand I used previously. Very pleased.
Works well, no complaints and no need to buy a more expensive version. However, I think a lot depends on the quality of the cloth you use with it.
This was great, even got the watermarks off off my shower screen, which are very stubborn!