Bulging Under Floorboard
Today, I was cleaning up the car during my lunch break and picked up some sweaters from the backseat floorboard. Underneath was a huge raised bulge. It's about the diameter of a basketballl and about 1/2 the height. It fills most of that side of the floorboard. I tried to push it down and it felt relatively sold, but still had some give. I searched the forum and couldn't find anything similar. Any suggestions?
The only thing that has happened to that side of the car is that I spilt a bottle of dish soap a couple months ago during a move. The car got to smell like lavender for a while, but that seemed to be the extent of the damage.
I also drove over a curb earlier this week, but there didn't appear to be any damage.