I haven't fitted them yet, but have a pair of PC cooling fans. low load and 12v . . . cheap as chips, should be enough to keep the screen clear.
last proper race I did was 60mins on Brands GP and it rained the whole hour . . . . car only misted up after the wipers stopped working, and the screen got cold . . . . . so another suggestion, if you don't have wipers, is to fit them.
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