I have a 1996 jeep grand Cherokee. every time it rains my driver side floor board gets soaked. I thought it was the door seal because it wasn't glued down so I cleaned it up and glued it down but my floor board still gets soaked. ive been trying to figure out where all this water could be coming from. ive read that there is a drain plug? but I don't see one from underneath? how do I get to this drain plug? also maybe any other suggestions on where this water could be coming from?? thank you