I did some further research on the internet and your product Super Iron Out came up.
Went to Lowes and purchased the spray, came home and sprayed in toilets and tanks and the rust stains just melted away. I couldn't be more happier. I've cleaned the shower with it as well.
I picked up the powder and put it in the water softener, it clean the rust right out of the in-coming water.
So many uses for the powder... I have also put it in the dishwasher and washing machine to remove rust stains.
Great product, thank you.
Picture Provided by: Summit Brands