Last week I had a new screen fitted. The fitter used a totally smear free product, so I asked what it was. Apparently not available to the public, only for new screens. I asked what the otherwise best glass cleaner was and was told screen wash. I mixed up a bit of concentrated screen wash into a spray bottle and for me it worked perfectly on glass, mirrors and other surfaces. Having tried vinegar and newspaper plus almost every product going, the screen wash and microfiber worked as well as Autoglym glass cleaner. If you have anything better I would love to try it.