It's not about elbow grease, or grinding the glass down at all. The product suggests that what most people call "pitting" is nothing more than natural pores in the glass that catch minerals and other deposits over the years. They say their product removes them and then seals the pores. As I said, we'll see.

My odometer milestone was that today my 300CD reached 123,153 (it's chassis number)

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick