There were obvious indications of ongoing leaks near the firewall, so I removed all the old windshield adhesive.

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It's common, during w/s removal, to repeatedly cut into this adhesive with a razor knife. This can result in overlapping cuts, where layers of old adhesive can contain slits that allow future water leaks. If the old adhesive is not completely removed like this, persistent leaks can require a messy liquid sealant be flowed around the w/s to wick into the slits. But it often runs out onto the dash, trim, or floor. Removing ALL the old adhesive while the w/s is out is easier, cheaper, quicker, cleaner, and better.

Owner caption May 2012 · Photo 4445 of 5000