I confess to being a huge RainX fan, using it from the late 70s when I 1st started driving. However, a friend recently raved about a product he had used called Autobrite Repel. Well being a sucker for a recommendation, I went and bought some though was shocked at the price - £14 for just 100ml, though it's used sparingly and is supposed to last. I only got round to applying it today, so have no experience living with it. Anyone else used it and have an opinion on it's effectiveness?