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If you know what you are doing, use an All Purpose Cleaner (P21S TAW) would be my recommendation) and remove all the crap they put on your seats.
Then, retreat with whatever you were using before.
I love the fact that they told you that this is their best! Clearly, they have no idea what they are doing.
-Go ask, how come the interiors of their brand new cars detailed by the same i-ditios do not look shinny.
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2020 G20 M340 xDrive - Portimao Blue - ZDA|ZPP|ZPX|1CR|1PE|6NW|6WD
2016 F10 535i xDrive - AW - Retired 
2011 E92 M3 - AW……………....ED April 29th, 2010 - Retired
2007 E92 335i -Space Gray.....ED Oct 19th, 2006 - Retired
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