Right, I've tried Unger hard, Unger soft, Pulex regular, Wagtail standard and now Facelift red. They all start off good and within a very short time all end up the same - they won't clear the moisture from the glass. The longer the channel the worse it is. Flipping the rubber makes no difference, changing solution doesn't help (GG4 normally). Changing pressure doesn't help, changing solution strength does help a little - when it's weak it seems to work better but then the rubber squeeks. I've tried removing the channel clips I've tried dog earing and no dog earing. Now the trad stuff doesn't get used much only for inside work - so ... does rubber go off?
What's causing it?
I notice my windscreen wipers although new do the same thing on my van screen. Is it something you live with or is there a cause?