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try opening your front windows a tiny tiny tiny bit, like a 1mm gap

im wondering if Rain-x stops ice forming as easily??? i mean it is alcohol based by the smell of it.
if you're brave you'll lift the carpets & see how wet they are underneath. bet there's a leak or a bung out somewhere if you get steamed up all the while.
don't think Rain-X helps that much, if it's icy, it's icy and you still need to scrape