Re: In stumped. Not easy to do.
With the gas caps located so conveniently, there is absolutely no telling. Kids dropping rocks, toys, cat poop (yup) in these old fuel tanks isn't rare at all.
I'd go one further, and put a double handfull of small screws, nuts and bolts and some ATF in there, hang the tank from a rope at it's balance point, then slosh everything back and forth. The smaller hardware will get into the corners better than mid-size nuts, and ATF is a decent cleaner.
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