There used to be quite a few who used to stand at traffic lights in cities with a cloth and bucket but I haven't seen them for a while.
Have you tried newspaper? I know someone who uss it for their house windows
I always keep a bottle of supermarket 'value' vinegar in the boot of my car (together with a kitchen roll). It's excellent for producing grease-free, glare-free windows.
Yep, recently had some now window units put in my dauble glazing and the fellas left this cleaner behind. It is brillaint, its called BOHLE Glas cleaner. Ive since bought some from them. Its a little dearer that normal ones but its excellent and you only need a tiny bit, hope that helps