This is my first post and of course I'm looking for something and not contributing

I have discovered that my carpet sponge is soaked with water so I have had to pull it out so I can dry it. While I had it out my brother ran a hose over the windscreen and down the vents on the bonnet and I could see the water coming in from under the centre of the dash. I believe that it is the drain from the scuttle panel that is blocked. However, I have no idea where it is. I removed the panel but couldn't see anything. Could someone please point me to a guide or upload a photo?
Thanks,