I recently purchased a 2014 Mustang and after careful research and a pre-purchase inspection I find that it does in fact have a water leak. I need direction as to where it could be coming from. It has 1 small spot on the driver rear floor in 1 corner. Not wet under or around the back seat so not from there. Does not appear to have come in through the window but not sure and it happened after washing and waxing Not raining. So I really need to find the problem before the rain comes. Thanks