Both of us Mamas have these old white kitchen sinks. They are always stained and pretty gross looking. The only way to clean them is with bleach or special bleach cleansers. It can be hard to clean with bleach because it is so runny. We would either have to spray it on, or fill the sink with water and add at least a cup of bleach and let it soak. After learning that baking soda can boost your bleach's cleaning power in your laundry, we decided to give it a try in the kitchen as a scrub. Baking soda is great for cutting grease and it won't scratch.
We mixed 2 parts baking soda and1 part bleach (we used a tablespoon for our sink) and stirred. It should make a nice paste. We used a lot less bleach and it didn't run down the sink before we could scrub down the sides.
Quick and easy