I laid tomatoes on the Corian countertop to ripen. They left a yellow stain that I cannot remove. Tried 409, vinegar, hydrogen peroxide. All to no avail.
Any surface can be stained if the right substance is left on the surface long enough.
Corian Countertops are "technically" not porous. That is what the manufacturer claims. However, staining does occur from common substances so the net effect is that Corian at least performs like a porous surface.
And most stains in Corian countertops are not like stains in quartz countertops where a chemical bleaches or discolors resins or polymers used to make the countertop.
Corian can stain from food or drink spills left on the surface and either absorbing or bonding in some fashion to the surface which makes the stains difficult to remove by simply wiping with a typical kitchen or surface cleaner.
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