I was previously getting these ugly black drip marks on the sides of my car, from the aging rubber seals on the doors and other places after it would rain. Almost by accident, this one mechanic recommended Gummi Pflege Stift.

I looked it up and the reviews were great so I bought some and WOW, this stuff WORKS! And it's STILL working! I probably put this on 6 months ago. Eventually I'll have to reapply, but this stuff totally rocks. Makes my car look soooo much better without the black rubber drip marks all over the side of the car.

1991 300d 224k

I bought this stuff about 10 years ago and have used it on my various W123 cars. It works well.

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1985 300TDT
2013 E350 Bluetec

Thanks for the tip on this I've been using a Meguars product with OK results, I'll give Gummi a go.

Tim