Is there a cleaning solution that works well for cleaning stone brickheaders, they are quite discoloured and a pressure washer didn’t do much?
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Not that I have an answer, but what kind of stone are they? If pressure washer didn't do much, maybe making a paste of something and leaving it for a while--try short amounts of time first, then longer. I'm not sure of what will hurt stone--acid ptrobably will etch it, especially if it's limestone. Have you tried just household bleach? (I'd just dab a little on a place that is inconspicuous and see what happens before doing much with it.) Nowadays with stone countertops they must make something to clean stains off those--maybe ask at a kitchen remodeling place?
Anyway, I'm just mainly answering to put your question nearer the top of the stack so someone who really knows something might answer!