I need some help with cleaning natural stone. One in particular is this rainbow sandstone. Had similar issues with honed limestone.
I can get off the surface algae but not the deep green and black stains. I want to achieve clarity in the stone and it’s driving me nuts.
I tested some hotter sh and it didn’t budge. I tested one restore straight. No change. I can make a difference in cleanliness but it’s not satisfying my ocd.
