I've had this issue too. I really is hard to understand why quite so much water gathers in the boot. I could understand a cupful, but at its worst, I think I would be looking at nearly 2 litres.
If you wanted 2 litres of water in the boot lid, I don't think any method you could choose would be nearly as effective as one that circumstance creates on the A8 D2!
Can you still buy the grommets?
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