White marks on bricks.

[Parky]

What about white marks on bricks, efflorescence I think it's called, around the line of the damp course? How do I get rid of that?

[BrummieDave]

In my experience you don't, and then the front of the brick falls off.

I had the National House builders Guarantee and brick manufacturers out and was told by both "it's perfectly natural". Might be, but it looks a right mess.

[Gaggsy]

You could try disclean - http://www.fhltd.co.uk/page8.htm
It might clean off the marks but it won't stop the salts coming through so you may need to do it again at a later date

[staffordian]

The worst of it can probably be brushed off with a stiff dry brush. I am sure I read somewhere that it is not a good idea to try washing it off, something about driving it back into the brick, IIRC.