I was replacing some damaged siding and decided to replace the old dirty insulation at the same time. After pulling out the insulation I noticed that the Romex running to two outlets had some brown sticky stuff on it. Any ideas what it is and why it's there? I'm including a picture of one of the the wires.
Went back and found a piece of the old insulation and took a picture. It looks like tar paper on the inside. That's probably it. Thank you.