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Concrete stain with merbau

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Guys,

Made the silly mistake of getting the decking guys to come and deck the place out.

What happened was the rain leeched color from the decking onto some of our concrete (yet to be sealed)?

The concreters tried to acid wash it without luck.

Any ideaS?

Thanks.
Try liquid chlorine mixed 10:1 with water, leave on for 5 min wash off (may need a little scrub')
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