Yellowing Sink......How to restore?

Awesome, from the dollar store. Just make sure you put it on evenly, it will cause streaks. You can also use it on the outside on the refrigerator vents, white door window frame to remove yellowing. When using it outside tape a rag or paper towels underneath so it will not run down the sidewalls, again causes streaks that do not come off. Really strong stuff, try it diluted first.