How can we remove stains from our white cast iron kitchen sink?

i like this stuff called CLR. ihave also used Kaboom and it works well too!!

I soak ours in bleach water once a week for 2hrs.
BTW thats for coffee tea & food stains.
Something like rust or hardwater I don’t know. Sorry!

GOO GONE !!!!!!!! MY DAD LEFT IT ON THE HOOD OF HIS TRUCK THE GOO GONE HAD LEAKED AND THE PAINT WAS OFF THE TRUCK HE WAS TIKED !!!!! BUT IT WORKS SOOOOO GOOD

From the Kohler site:

Fantastik Antibacterial Heavy Duty
Formula 409 Antibacterial All Purpose
KOHLER Cast Iron Cleaner (for occasional use only)
Windex Original
For rust removal:
Bon Ami

Rinse thoroughly and use a soft cloth to wipe the product dry after each use.
In the rare occurrence of stubborn stains, use abrasive cleaners sparingly.
Do not use steel wool, wire brushes or abrasive
sponge pads.
Be careful not to leave dirty dishes, coffee grounds, tea bags or other staining materials in contact with the enamel surface for extended periods of time.
Consider kitchen sink accessories such as bottom basin racks and rinse baskets to help protect the surface from scratches.

Super Iron Out Multi-Purpose Rust Stain Remover
Zud Multi-Purpose Cream Cleanser

Vinegar will take stains out of the porcelain coating on the cast iron.

I suggest you try cleaning it with Barkeepers Friend. You can usually find it in groceries. It takes very little for scuffs and cleaning and you may add some bleach to it if this doesn’t get the stains off.

hands down Jan C. is correct. Barkeepers friend is with out a doubt the one i would use any day. POWDER ONLY the liquid bites. it is perfect for brass too. its effortless.