There's a place called Aussie desert cooler which sell two halves one for each end of the windscreen. He said that it plugs into the cigarette lighter and rubs continously but can be garwured and made to work with a switch.

But I'm thinking if it's powered by cigarette lighter than it may not gave enough juice to demist the windscreen?

They only cost 100 for the pair but I'd want it to work

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I'm a jockey kunts...