This stuff is amazing to remove rust.
Evapo-Rust The Original Super Safe Rust Remover, Water-Based, Non-Toxic, Biodegradable, 1 Gallon https://www.amazon.com/dp/B00M0TLQ66/ref=cm_sw_r_cp_tai_WJ5rDb1VSQ5B4
After you can polish with this stuff.
Flitz Polish - Paste - 5.29 oz. Boxed Tube https://www.amazon.com/dp/B00J4Y1O80/ref=cm_sw_r_cp_tai_sM5rDbRN3QH30