Our house is a ranch, with a full basement. The lot is sloped so you can see about 1 foot of basement at one end of the house, and the entire height of the basement at the other end. The basement is made from contoured cinder block. (It's not the plain cinder block, it is sort of contoured so as to look more "natural" and is much rougher.) As a result of the Presidents' Day blizzard, we got snowdrifts up to almost 4 feet high, especially up against the house. When things *finally* melted enough to be able to see the basement again, I found very ugly white stains on the blocks. I'm thinking it's calcium deposits - at least that's what it looks like. I've asked several people how to clean it off, and the only suggestion was a wire brush.
Well, the wire brush doesn't work well on the rough contoured surface. It doesn't get into all the "nooks and crannies" to get it out.
I also tried using some Lime Away Calcium, Lime and Rust remover (half and half with water), but that didn't seem to do much either. I saw it fizz on the calcium deposits, but after it was rinsed and dried, they were still there.
And to make things even worse, we're trying to sell our house and have an Open House this weekend. For obvious reasons, I don't want ugly white calcium stains on the basement making it look like it leaks or something! (By the way, even with all the snow, it didn't leak - it just looks like it.)