The sheer lack of manual R's and GTI's on here will make it hard for you to get an answer i'd say. The stench from an abused or slipping clutch is very distinguishable as you no doubt are aware of, so hard to confuse it with anything else. Weird that you say that it doesn't appear to be slipping, although you can smell it.
Unless, like you say, the car wash boys tried to do a fully hektic AWD burnout in it (and this is the reason why i never leave my car with just "anybody") and burnt the clutch out, then the smell is just oozing out over the next few drives. There is a small hole in the bottom of the transfer case where you could try to have a look inside at the clutch - or at least a smell. Perhaps blow it out with some compressed air and see if the smell goes away?
I actually slipped my clutch quite badly a few months ago (totally my fault) trying to do a fast launch and the smell was very apparent in the cabin a few seconds after. The smell actually lingered for a few days too.
Lots of guys in the USA with R's have had to replace their clutches already, although im sure the manner in which the car is driven will have some affect on how long the clutch will last.
If you do have to replace the clutch, id recommend getting one of the kits that allows you to keep your DMF (dual mass flywheel) and simply upgrades the clutch component for increased torque - something like this: SACHS Stage 1 Performance uprated clutch kit 2.0 TFSI / TSI | VI R 2.0T-FSI 199 kW (270 PS) | Golf | VW | LOBA Motorsport GmbH
Otherwise your other options are stage 2 or stage 3 clutch upgrade kits which all upgrade the flywheel to a SMF (single mass flywheel). Mind you, all of these kits which replace the flywheel with a SMF unit are noisy.
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