Do you have a cream brick with this type of staining?
This is called vanadium and it is a mineral deposit found in the lighter coloured clays. You can easily remove this unsightly staining with common household chemicals. For extreme cases... I would recommend a diluted solution of oxalic acid but for most cases products like liquid chlorine, bleach or mould killer will neutralise the stains and return the brick to its normal colour. Simply spray these products onto the dry brickwork and you will see the stains disappear before your eyes. Then once you are satisfied with the result just rinse the bricks off with a water.
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