You can poultice with Barkeep's Friend on porcelain - don't know how it would work on brick. Just wet the surface of the stain and sprinkle on, or make a paste and apply it just to the stained area. Have used it for years instead of Comet. Smells kinda funky but works real well on porcelain stains, as well as on stainless fixtures and sinks which Comet and other chlorine cleaners can leave with a rusty stain around the edges after a while. ~deb [log in to unmask] wrote: > K- > > I get oxalic acid at the hardware store - comes in a box. I think > Rainbow makes it. > > VI > -- **Please remember to trim posts, as requested in the Terms of Service** To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html>