There’s a sharp bend where the drains change direction to go down the C-pillar - didn’t want to force the drain brush down given how much effort it was taking, so I might blast a bit of compressed air through them in future.

On a 10k mile car with no blockages, the entrance holes of the drains were just starting to rust…

If your drain holes are still ok this is a great answer to the problem. I have done mine.

 overfinch modified

Thank you for sharing. I will hopefully get time this weekend to check them.

Then plan the preventative fix.

I was also able to see the clips and placement in the video. So that helps me to be able to remove the trim. SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

I managed to check them tonight. No blocks and no rust. So I will look to order the pipe inserts before anything happens. SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

The 2nd video from the same UTuber as a follow up, is a must watch as well, as it shows the end of the drain pipe that is removable exiting where aux battery is and can be used to also assist clearing blockages etc

 2018 SE SDV8 4.4 Byron Blue

Thanks Kot.  overfinch modified