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Products made from non-stainless steel will rust over time. Rust is the result of the oxidation of iron in the presence of water and oxygen. Your product has a pre-painted or powder coated finish applied to the steel, but over time and with usage, this finish may deteriorate. For best results, please perform routine maintenance on your product - see manual for cleaning instructions, and use a high quality cover if storing the unit outside.
Stainless steel items do not "rust" as you think of regular steel rusting with a red oxide on the surface that flakes off. Stainless steel will turn a yellow color over time. This is a natural occurrence due to the heat of the fire on the stainless steel. This can be reduced by using a high quality stainless steel polish.
If you do see some red rust it is probably due to some iron particles that have contaminated the surface of the stainless steel and it is these iron particles that are rusting. Commercially available "pickling paste" can also be used. See "Care and Cleaning of Stainless Steel" for more information.