Update.
I've removed the sound deadening in the passenger side so far, it's wet through underneath from the front to the rear seat mounts, there's no way they'll dry properly unless left in a warm place with the doors open. The other bad points are that the bungs in the floor hold water like a little dish and they're rusting on my car. I'm removing the bungs and replacing them as they're already rusty, I'm sure that many cars are silently rusting due to this issue.
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