On Thu, 10 Jan 2013 16:10:35 -0500, "Percival P. Cassidy"
wrote:




I've done that, and it works, but only till next time: the rough surface
stains much more easily. I'm looking for a longer-term solution.

Perce

Aside from refinishing, there is none. You have porosity and it
allows absorption of the gunk in there.

Soft scrub should be call Delay Scrub and it is still abrasive and
will just take longer to ruin the sink.