I have a 2010 Fusion SE with a sunroof. Below both rear doors by there is an unusual amount of rust compared to the rest of the car. (About a 3x12" hole / damage) I'm wondering if the sun roof drains in this area for two reasons. One is that the cause? And two I plan to do a very backyard rust repair where you use expanding foam to fill in the huge hole and I don't want to clog the sunroof drains. I'll probably end up running water down the drain to see where it starts draining but if you know, it would make me feel better to know ahead of time!