I'm sure I've read somewhere about using a steam cleaner (pressure washer type, not wallpaper type!!!)
As 4v6 indicates, getting ALL the fuel AND vapour out is essential.
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1985 WR quattro
2010 A6 3.0Tdi Allroad
2010 A3 1.4 tfsi Sport - Sold but still in the family
1984 80 Quattro - Sold many moons ago
1981 Coupe GT - Sold to buy above
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