If you have an AC, use that to demist the windscreen. It works quicker than any other way. Hot air actually mists it more until the temp of the glass and interior become equal.
As Mother Nature pointed out, leaving the window open a touch also helps.
My AU series 1 was always fogging up, I've never owned a car that was a bad as it for fogging. The slightess hint of rain would be enough to mist the windscreen.
I bought a product from a market called Mist Away. Its one of those Demtel, as seen on Bert Newton type of product. You put it on the windscreen/mirror/glasses etc, let it dry and buff it off like a polish.
It is the best stuff I've used. Glass would last up to aorund six weeks before it would start to fog up again. Even the bathroom mirrors wouldn't fog.
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Sept 03 BA XR6 Turbo, Silhouette, T5, APS Unichip, BPT short shifter & Momo bits, FPV pedals, Custom Leather, 18" Wheels, PBR sports calipers, Window Tint, Typhoon CAI, Side stripes.
I find that with a 6 or 8 cyl leaving the air co on 24/7 helps a heap. I have found it make little dfference to economy and I never get fogged screens. Running it all the time also means the seal dont deteriorate as fast as leaving it off 1/2 the year
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