In both the Jag and current car I used Autosmart Clearview screenwash, diluted at 4/1 and it had always been very good with a lovely strong smell, but when the temps dropped it started freezing up, even when we changed the ratio to 2/1. It is too expensive to use neat so we went looking.
We spotted a good offer with bulk buying Polygard Arctic so we initially got a few hundred litres in and have been using it neat since in the current car, other employee cars and the HGV fleet and it's been excellent. No freezing even when temps hit -10°C and no smearing. We did make sure to empty all the tanks before filling with the new stuff.
I've been very conscience of clogging since having the BMW many years ago as they seemed to be quite notorious for it (colleague had exactly the same car and it happened to him). I have a feeling it's not so much the screen wash you use, but perhaps mixing different brands? If I decide to change brand I will run the screen wash to empty first.