There are some salt neutralisers out there, but again they tend to only be a temporary fix and some of that looks like it might be staining rather than actual efflorescence. Wire brush might well be your best bet, but don't go too heavy on it.
Efflorescence needs to be scrubbed off with, say an 8" heavy duty hard bristle scrubbing brush.
Dont use a wire brush or you will end up making things worse. Thats a foolish suggestion.
Dont use any liquids or chemical concoctions either, they too will make things worse.
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