Honed is not polished
Honed marble has a matte surface that reads beautifully in natural light and shows water spotting, product residue, and oil far more readily than a polished finish. Nothing is wrong with the stone when this happens; the finish is simply more honest.
Because marble is calcite-based, acidic products etch it. Vinegar, citrus cleaners, and many bathroom products will dull the surface. The damage is physical, not a stain, so wiping harder makes it worse.
Principles that protect the surface
Use pH-neutral products intended for natural stone. Keep dwell time short. Avoid abrasive pads and powdered cleansers. Address spills quickly, especially wine, citrus, coffee, and cooking oils. Dry the surface rather than letting it air dry, which is where most spotting originates.
Blu Lux does not publish chemical mixing instructions for homeowners, because the wrong dilution on the wrong stone is expensive. If you are unsure what your slab is or how it was sealed, ask your fabricator before experimenting.
When it is no longer cleaning
Etching, dull traffic patterns, and deep staining are restoration issues. Honing, grinding, polishing, and stone repair are separate specialized trades. Blu Lux performs cleaning and will tell you plainly when a surface needs a restoration specialist instead.