Ok - it seems that Sillblade are not as good as they are cracked up to be.
Reading through all the responses it would seem that there is actually a design issue with the drivers side wiper as most seem to have the issue irrespective of the blade. Whether it is an airflow thing or weak springs in the wiper I am not sure but does seem to be a common issue.
I used Rainex when it first came out in the early 70s and it was a no no to use the wipers as it smeared the Rainex - I assume the product has improved. Are there any other products that might lubricate the screen to allow the blades to move smoothly over it?
Garry


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