To fix the leaking windshield problem just get a tube of black silicone. Cut a small hole in the tip and lay a bead around the gasket. Just did that on the front back gaskets in one of mine and it works fine.

Also, if that doesn't cure the leak you may have a rusted drain hole underneath the battery. This allowed water to seep into the passenger compartment on mine and find its way into the back passenger area. Took some silicone and sealed that hole up as well.

Silicone is great stuff!

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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000