http://www.fmsap.co.uk/product_desc.php?id=19883
Auto Glym Aqua Wax. Use it when car is wet after you've shampoo'd it, doesn't leave any streaks or smears, fantastic stuff, Stamford recommended it to me and I've used it for 2 years now. I know what you mean with the smears- I had the same problem before I used that stuff.