|Sink before cleaning.|
|Sink after cleaning.|
So what is this safe, simple, effective, cheap and easy powdered cleanser? Baking soda. Yep. Plain old baking soda. I just sprinkled it on and scrubbed a little with one of those scratchy sponges (wet, of course) and the stains disappeared.
We also use our chest freezer as extra counter space and I've been really pleased with how well plain old baking soda cleans that surface. And if I don't get it all rinsed off, so what? It certainly won't hurt us to have a little stray baking soda where we're making sandwiches. Might taste funny but won't hurt us.