How do you all store spare steel fuel tanks that are not currently on machines? This Could be those tanks in storage for future builds, backups, to sell in the future, etc.

Some methods I have read about
-WD-40 fog
-Fill full of fuel
-Fill full of oil

Any best method or one that you have had long term luck with? I currently have a trx70 fogged with wd40, I iust don’t know how long that will prevent rust for. I also have a tank off my 300 I need to do something with.

I am not so worried about surface rust as it is easy to remove so is it best to just store them dry, maybe with some desiccant packs inside?