LAZ wrote:I have a 1920s kitchen with an elderly white porcelain sink. Not only does it get gray scrape marks from every pot and pan, but there are are ancient stains I can't seem to remove.
I've been using bleach-based scouring powder to no avail. Any other ideas?
And, once I get it clean, if ever, what can I do to keep it from getting stained again?
LAZ,
I just moved into a new house only to find that the new Kohler tub had dark gray metal scratches from the install. The contractor called Kohler and a tech came out and cleaned them right off with a "special cleaner." I asked what it was and he told be some sort of acid. I'm guessing that it was something mild, like a muriatic acid, diluted a bit. I'm sure you can find some ideas about how to clean porcelain with muriatic acid online. Another option, if you haven't tried it yet, is to make a paste with Borax and lemon juice. Vinegar, Bar Keeper's Friend, and Oven Cleaner has also been known to work on porcelain tubs and sinks.
Good luck.
"It's not that I'm on commission, it's just I've sifted through a lot of stuff and it's not worth filling up on the bland when the extraordinary is within equidistant tasting distance." - David Lebovitz