I'd forgotten about that trick with the bottle and pipe to empty the centre, but having left it open and blowing (spraying!) for a long journey that has dried out now.
It's only the rear carpets that now have any significant dampness and silica gel bags are good for that.

All the drains are checked and clear (except drivers side condenser tray TBD) including the wheel arch and scuttle.
So it's just a matter of finishing drying out now and putting stuff back. Not ideal weather. :(

Drivers side condenser drain came out today, same sort of crud inside with birch seeds predominating. :(
No water ran from the tray so the other side (slightly lower where parked) is working OK. :cool:

It's all pretty dry now, with the help of a couple of 500gram bags of silica gel. It's not obvious how well they are working as the indicator strips with them are difficult to interpret, so I've taken to weighing them on kitchen scales.

This seems to be a good guide not just on how much water they've absorbed, but even more so when they've dried out again sitting on my central heating boiler.

The car seems dry, no condensation and no damp smells, nonetheless the bags soaked up about 25 grams of water overnight sitting in the rear footwells. I'll have them there as much as possible doing their thing from now on.

Good to hear its clearing up. The residual problem is often the damp smell that seems to linger. You now need to:

1. Cut down all the trees.
2. Get Ainar (or someone else good with electronics) to devise a moisture level sensor in the drain/carpet area to bring up an alarm on the DIS.
3. Clear the drains on a regular basis.

+++

Glad to hear its coming good +++

In reverse order, I think ;)

I was wondering if it was possible to rig up some small diameter tubing leading to and pointing into the drains, but not blocking them, that was accessible for squirting from an air duster or similar.

Its not a bad idea, but do you think squirting water down a blocked tube will be enough to clear it.

The other week when I did the sunroof drains on mine it took a fair bit of pumping the killaspray bottle which was sealed on the end of the drain tube to get the crud to clear itself

I was thinking air. ;) And yes, based on the many blockages I've seen a regular preventive squirt will blow out most if not all of what accumulates before it blocks.