just thought I would post this as a result of a problem I have encountered and fixed.
Let the kids in the back of the car only to find the foot wells absolutely soaked.
An inch of water.
This was during the rainy season and just after I had opened the sunroof for the first time.
I feared the worst and expected the perfect rooflining to start sagging.
However I finally diagnosed the problem to a leaky rear wash wipe pipe running through the interior of the car. Seen as though the rear wiper doesn't work, a quick zip tie in the engine bay has sorted that out!
So if you are faced with a wet inside, check the screen wash pipes first.