Cleaning curing new rock with Clorox

Hello
I'm curing about 180 lbs of rocks in rodi water and wave maker, for past 3 months, regular water change and occasional lanthanum dosing.

I still see some debris on the rocks, dark brown patches.
What is the best way to remove them? I won't be able to scrub them individually as it's too many and in deep crevices.
Will Clorox bleach or pool shock be helpful in removing the stains?
I know chlorine is a big no. But it's still curing for another few months. And I expect all chlorine to be out.
Please guide.
Thank you



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