I've suffered smearing on my windscreen over the years, and its always worse in autumn/winter, and I think I've finally found something that works - Barkeepers Friend.
http://www.lakeland.co.uk/8868/Bar-Keepers-Friend?src=mpcle
Its a powder with a very very mild abrasive action, and is used to clean lots of different things. For your windscreen, first clean all debris/grit etc using just water and clean kitchen roll (you want no gritty particles left to scratch the glass during polishing). Now dampen either a clean microfibre cloth or blue paper or kitchen paper, sprinkle just a little powder onto it, then lightly polish your glass. When finished, rinse thoroughly to remove any white powdery deposits.
Personally, I find doing this job in the rain is best, as you've got a constant supply of soft water before, during and after polishing, and I have to say the results are amazing.
Before anyone asks, I will benefit in no way from this, I am simply passing on my conclusion to a problem that I've also suffered from for a long time. I shall also post this on the other 'windscreen smearing threads' in order to share the information.
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