For an easy, cheap, and green way to clean my classic, white cast-iron enameled kitchen sink, I scrub with a mixture of baking soda and vinegar.
After rinsing, I add the stopper to the drain and pour hydrogen peroxide into the sink to cover the bottom. I let this sit for 15 to 20 minutes and use a sponge to clean the sides of the sink as needed. Any stains disappear and this leaves the sink super shiny.
There’s no odor and it’s non-caustic. Juli