Removing Wiring Corrosion Help

Laquer thinner for tape/oil residue on wires.
Backing soda and water, blow dry and wire brush or emory cloth for connectors followed by dielectric grease.

Use the correct non-adhesive tape to rewrap harness.

When my Dart was painted back in the late 80s, they fogged yellow on the top of the inner fenders and firewall. Guess who got to clean it all up ??