Paving bricks - white deposits

[Terry Pinnell]

Some of the bricks in my recently paved drive have unsightly patches of white appearing on them. Is this salt or some such? What makes it appear? Can anyone recommend how best to remove it please? I tried simply sponging and scouring a few with cold water, but I can see no difference now that patch has dried.

[Cerberus .]

It's brick efflorescence see;

[John Rumm]

Another take on it:

[The Natural Philosopher]

pressure washh it, or simply leave it for a year or so.

The rain will eventually wash it off.

[Terry Pinnell]

Thanks all, very helpful.