I just bought couple months ago 2010 cts with 16,000 miles. Every drain got clogged & leaked. Everything fixed, but when it rains or I wash my car. I get this cat pee smell.... They said there's no more leaks, but my car keeps giving the horrible smell when car gets wet. They can't figure out & I'm getting so frustrated!!! The smell is coming from behind the main liners of the car. It coming from behind the walls of car & when I go in my trunk & on right side. I'll take off the cover against wall to right, to where the battery is. The smell is also inside there also. It's like the smell is going through my car, behind the walls.