The rear footwell was full of water after all this rain. I extracted a few litres of water using the wet and dry vacuum cleaner.
I thought I had it all, but then the carpet started looking sodden again. I have done it a couple more times now, and after 30 minutes, the carpet is wet enough that I can extract another mug full of water.
I assume there is foam under the carpet, and that's saturated. Is there any good way to dry that out?
Ideally, we'd put the car in a warm garage with a dehumidifier, but we lack both of those.
I've cleaned all the rubber seals, by the way, as I think this is where the water is getting in.