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The seal that stops water running down inside the door, what the window slides between.
This bit:

They're dying on my car and as I'm taking half the doors apart anyway to fix something else I might as well replace it, but my Googling is failing and I'm blowed if I can find the things online anywhere, or even what they're called.
"Window seals" just seems to give me the side & top seals, is there a specific name for these? I don't need to replace the whole way round, just the bottom "wiper" ones. And as a bonus: where's a good place to buy these for a Renault?
Weather strip?
Scraper seal
I'd look on Ebay. Loads of car parts dealers on there. "Weatherstrip" or "Window trim" seems to find what you're looking for - beware of Chinese sellers if you're in a hurry though!
Having bought one for my Volvo a few years ago usually the only place to get them is main dealers and unless you've got a parts ID for the car it's difficult to know their  part number or description to try and order online.
But if it's a Renault surely you'll be on first name terms with your spare parts manager anyway?
'Door to glass weatherstrip' (by Mazda, anyway)
Have you tried some Gummi Pfledge first?
Thanks all, will have a look around 🙂
Have you tried some Gummi Pfledge first?
Interesting. I think it's probably too far gone but will have another look with that in mind.
Wiper seal.