Well, I did a little green research and this is what I came up with...
You will need lemons and baking soda.
Make a paste with it.
And then apply the mixture to the sinks and scrub.
Let sit for a few minutes. Rinse. Repeat if necessary.
As simple as that. :)
Hope that helps lady!
Happy 'it's the middle of the week' day! Yay!