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By the way: Is this already common knowledge? ( I'm in doubt): As I read in 'Yeager, An Autobiography', he used DRENE Shampoo in his experimental flights with the X-1 aircraft against windshield freezing. According to a proposal of his first attendant. They also continued to use it even when they became a bottle with special anti-freeze mix which costed 18 Dollar per unit. To make a long story short: DRENE Shampoo helped essential to establish the first supersonic flight.. ( I read the German translation, 'Yeager, Schneller als der Schall'. It is on page 166.)