Popped back down so obviously thawed out during the day, but absoloutley nothing was happening this morning at -5 no light spray and no windcsreen spray. Very very Dangerous on a 30 mile motorway drive.
The more I think about this the more I think it is screenwash, simply because it froze when it made contact with the sides of the car around the light. Trip to VW on the way home, coupled with 5.5 litres of shoddy windscreen wash going over the Car, hoorah for quick dispensing light washer jets! I would do TPS but I'm not trade and it's a bit of a drive.
Moral: All screenwashes are not created equal!