Our house is 120 + years old, with 20" thick walls. The (new) kitchen was added about 15 years ago, and what used to be an exterior brick wall is now an interior. The previous owners plastered over the brick, and for some reason I decided I'd like it better the way it used to be, and removed the plaster. Well, I have a couple problems now.... one, the mortar is a bit sandy and you have to be careful with it, but more importantly, there is a white residue on the brick that I'm having a heck of a time getting off. I seem to remember that brick is easier to clean if it's saturated, but that isn't really an option here. Soap and water does nothing. Wire brushes do nothing. Is the answer chemicals? For me or the bricks? :-) I have pretty much exhausted my arsenal of fixes, so I'm hoping I have overlooked the obvious. Thanks!