There are AC drains somewhere that I have heard other people talk about getting clogged and causing water on the floor also. I have never ran into it before, so I can't tell you for sure where they are to clean them out. Maybe someone else can chome in that has done it. I know Farnsworth has.
On another note. I have something coming up that may be the permanent fix to the rubber seal, yet just as easy to remove if you need to get to the cabin air filter. You will be able to do away with the piece of rubber altogether and NEVER have to worry about it again. I will be test fitting one on my car very soon and will keep you all updated.