PowerPig you are correct. My '80 300SD W116 windsheild had a little of this whitish discoloration around the edges. I thought someone had used a can of spraypaint near it. When I brought the car in to have the windsheild and rear window gaskets replaced they told that it is actually the glass delaminating. Typical with age. They couldn't promise not to break the glass when they removed it and would not accept the responsibility for breakage. Guess what - I had to get a new windshield but the rear window came out and went back in OK.

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1979 300SD 83k miles Astro Silver Metallic/Black leather #3447
1990 350SDL 202k miles (3L engine from an 87 300D)Black/Grey leather
2006 Pleasure-Way Class B MoHo (Sprinter chassis) 134k miles
2005 E320CDI 270k (car is sooo fast - I can't believe it's a diesel!!!)