Any ideas on how to clean rust out of metal Jerry can?

I would never even think to mount my cans in this location.

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Does no one else realize you could simply fill it with white vinegar, let it sit over night, then shake it real hard possibly with a few nuts in it in the morning? Ive used this technique on all kinds of things from tools, can, to metal plates (before welding etc.).... Strips every bit of rust off and CHEAP!
20 liters white vinegar will cost hell lot of money.