You'll probably have the same experience as I do with rarely used cast iron.
The oil will be rancid and a bit sticky from polymerization. The best cure for those conditions is high heat to burn them off. Then some new oil to refresh the patina.
If rusted, yes, just scour it. Bad rust you may want to try a soak in Coke for the phosphoric acid to help you along. I've read about people doing it but have not done it personally.
Camp Chef makes a product based in coconut oil as I recall that resists rancidity and polymerization. You might give that a try for your next long term storage coating. Google on "Camp Chef Conditioner". It's also good for regular treatment and seasoning of cast-iron and carbon steel. I've gone through a bottle and a half over the years.
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