Years of rust proving removal?

1968dartman said

You will probably end up hurting the paint if you find something that will soften up all that undercoating! Sorry. Try a heat gun to soften it up and peel it off very carefully.

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Yes, heat it up and scrape it off with a plastic paint scraper available at any home improvement store.

Then clean the residual with brake parts cleaner/laquer/kerosene thinner on a rag.