Originally Posted by MustangFirstCar
Also, just in case anyone is searching for solutions to this and come across this thread, I'd like to say that the water can be easily drained out by removing the floor mat and spare tire and then pushing down on one of the drain plug grommet things at the bottom (wires are routed through it until it pops out. I know this seems obvious but it took me a full day to figure that out so in case anyone else doesn't know I thought I'd post it.
Even more obvious is to make sure that you
REINSTALL or pop the drain plug back in after
draining the water.
If not, you will have a wet spare tire well the
next heavy rain drive you take...