Hello, yes I experienced steamy windscreen on cold mornings inside above the screen vents before I found the drains blocked.
It is not hard to get to them at all. 10 min job really at night with a torch. Just pull the carpet away/down either side of the transmission tunnel under the dash as in the photos. The pipes pulled loose and refitted for me without removing the metal band.
The pipes also have grey foam pipe lagging around them that you need to remove for better access.
Just beware water may gush out so you may wish to catch it. I would advise just completely pulling the rubber pipes out of the car - they are only 4" long and easy to refit, if difficult a little soapy water should help secure them back into the holes in the chassis.
I bought some foam cleaner in an aerosol with a long straw, filled the a/c box with foam and let it drain out, it was full of black bit. I have done it twice and only used half a can, I may as well use it all up.
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