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Hey folks, I'm resurrecting this post. The reconstituted blocks now are almost luminous green. I've tried WET and FORGET, waited for 4 weeks then pressure washed and it doesn't work on the limestone reconstituted blocks. I've tried pure chlorine and left for 24 hours then pressure washed and...

Hi folks, I've got a lot of mold on my limestone driveway and reconstituted limestone retaining walls, anyone know of a solution that kills the mold? A high pressure sprayer works on the driveway to a point but doesn't do anything on the retaining walls. The driveway has tiny black...