The rear seat of my 300SD was extremely clean... nothing in it at all.

The rear seat of my 500SEL was full of children's toys, dirt, junk, some gas receipts (looks like a bundle fell in there) and millions of candy wrappers.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver