Barracuda deck panel surface rust suggestions

Hi all. I’m starting to work on fixing some rust in the back window corners of my 67 notch back barracuda and I have this rust under the rear deck panel where the speakers go. It’s surface rust, not rusted through anywhere but if left untreated I’d imagine it wouldn’t take long it looks like it was caused by condensation. Any suggestions how to slow/stop the rust without replacing it? Thanks everyone for your time and help and suggestions.

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