To ensure the longevity of your rustic steel lantern outdoors, regularly remove accumulated dirt with a soft, damp cloth and clean water, without using harsh chemical cleaners. For iron or steel models, it's also important to protect the painted surface from damage to prevent corrosion; any rust spots should be treated with steel wool, coated with rust converter, and then repainted. Additionally, make sure the air holes in the base remain clear of dirt and leaves to allow for proper ventilation.