This cute little bowl got stained months back after I put it messy, in the sink – overnight. I rapidly started cleaning it the following morning when the stain was uncovered, as though the stain may not be set. It obviously was in any case, and no amount of furious scouring could undo it. The harm was carried out. My really little bowl looked grimy when it is really clean.
After a couple of months, stain is still there. This time however, as opposed to washing with water and soap, I topped it off with water, included a couple of tablespoons of bleach and let it soak.
Voila. Stain vanished within an hour.
***DIY source: www.areal-lifehousewife.com