This article is from the VW Technical FAQ, by with numerous contributions by Jan Vandenbrande others.
A: I have so far not found any "miracle" solution.
A variety of suggestions however exist:
- Vacuum all the dust and sand from the seam (it causes the seams to tear)
- Moist rag for occasional cleansing
- Meguire's leather treatment
- Saddle Soap and Mink Oil
- Lexol Cleaner and Conditioner
 
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