ANY matte materials grabs dirt and oil and requires cleaning, and drying both, in order to look nice. If you don't dry them, they will look streaky. Footprints show on matte vinyl floors and streaks show after cleaning, if you do not also dry them. Same with quartz. Way back in the first stone age, when the Orignal quartz, Silestone, was first introduced in the US, you had no issues, because it all was polished. They then came out with matte quartz, and they they had ALL of these same issues. And they took it off the market. 15 years later, and matte e-stone is back on the market from all kinds of brands. And it all does the same thing. Matte surfaces have texture. Dirt and oil gets in that texture, and takes extra effort to wash and dry. This is not a material issue. This is a cleaning issue.
This has zero to do with "grade". Grade in the slab yard context has to do with pricing levels only. Slab yards are there for the fabricators. They are not retail. They are wholesale, and do not sell to the public. You are not their customer. The fabricator is. To get any type of help requires an appointment through your fabricator.
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