we really like our 2012 Optima EX. Being a designer engineer I get anal and start to look at things and say why did thy do it this way??. One item is we have owned suv's or trucks for over 13 years and right now my peave is the rear glass on the Optima. When it rains the rain just beads up and goes no where. It doesn't flow downwards with the air current, it just stays ther on the glass making it very hard to see out the back window. I have tried different cleaners but to no avail. will try auto wax to see of the rain runs off. Anyone else notice this or find a cure. Thanks