Speaking of heaters, duting the summer I had the little plastic cover off of the wing top heater inlet, I found the inlet box underneath was half full of water. A quick poke about with a small screw driver cleared the drain, which had become blocken some time over the last 17 years, letting out about a pint of manky mucky water. Now the heater seems to work a lot better, and you dont get that sudden mist-up defenders are prone to from time to time.
Dave