That's a great question! A rusted-out bottom is the most common reason steel trash cans fail, but it's totally preventable with some simple, regular care. The key is managing moisture, which is the enemy of steel. Here’s a natural, step-by-step approach I use and recommend.
First, start with a deep clean. Empty the can completely. Give it a good scrub inside and out, especially the bottom, with warm soapy water to remove grime and acidic residues that speed up rust. Rinse thoroughly and let it dry completely in the sun. This is crucial—trapped moisture is what starts the rust process.
Once it's bone-dry, the magic step is creating a moisture barrier. For the interior bottom, a simple plastic bag liner is your first defense, but for extra protection, consider placing a custom-cut piece of plywood or a rubber mat at the very bottom to elevate your trash bags slightly off the steel surface. For the exterior bottom, applying a rust-inhibitive primer and a coat of outdoor-grade paint or a clear waterproof sealant can work wonders. Just make sure the area is clean and dry before you apply anything.
Where you place the can matters immensely. Try to keep it off constantly damp ground like dirt or grass. Setting it on a concrete patio, bricks, or a specially designed trash can platform allows for airflow and drainage. If you must keep it on soil, a simple wooden pallet can lift it up.
Finally, make a habit of tipping the can to drain any accidental liquid buildup, and give it a quick rinse and dry every few months. A little proactive maintenance every season will add years to your can's life, saving you money and hassle. It really becomes second nature!