Just wondering how effective everyone else's rear defroster is. When my back glass is fogged up in the mornings on the way to work the rear defroster (back glass) does not get warm enough to defog the glass. I took it to ford with this problem last year but they said its getting power so it must be the grid in the glass. So my question is how effective is your rear defroster? will your's defog like I expect mine to do?