>>I reckon my wall actually might respond well to my pressure washer....
I would be very careful about that.
The salts are transported to the surface by the wall drying out. With houses it usually is that the bricks have been stored badly and allowed to get soaked before they are used. But once they are in the wall and allowed to dry out, and the the white salts removed, the problem goes away.
In garden walls the brickwork is exposed to rain from both sides, and particularly from above if there are no adequate copings, and so the problems can be much worse.
By using the pressure washer you may soak the bricks again and re-activate the problem. Dry brushing or minimum use of liquids is preferable.
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Brick cleaner new
Brick cleaner new
