First, I don't think that's caramel, I think it's rust.
The card will soak. I think some of that will leave the card, but a bit will remain.
And Dick Towle has the products, tools, knowledge, and skill set that enable him to remove that. And if he can't, then I have doubts that anyone could.
You might soak it, and see what you think of it after the soaking. Then, you could contact Mr. Towle. Soaking is free, Mr. Towle isn't.
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