Inside the windscreen glass- what cleaner do you use?

My window cleaner called the other day and I asked him about cleaning cloths as he makes a splendid job.  Apparently the cloths that he uses are what is sold as Window Cleaners Scrim.  As you say, it's linen based but it's a bit more open weave than a teatowel. Found some here:

will report back when I do the car but the polish that SHCM recommends combined with this cloth make a cracking job of my patio doors!