Wet patch in driver footwell of Ford Focus Zetec?

A wet patch keeps coming back in the footwell of our Zetec, drivers side. Its about the size of a hand and is not near the door sill, no water coming thru door seals etc, Bone dry around it. Its been dried out again n again n it seems to come straight back. Seems like its coming from.underneath the carpet. There's no holes I can see in bodyqork, it seems in great condition.

Does anyone know what this could be, when I put my fingers under the carpet, I can feel a rubber cover of dome sort. Could this be a blocked drain and if so any ideas how to sort it.

I had a 2000 focus that did that too when it rained really hard - never figured it out but either a leaking seal around the bottom of the windshield or firewall leak - check focusfanatics.com they have many FAQs and tech help sections.

Do you have a sunroof? Check the drains for clogs.

No no sun roof

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