Can I get a haze off of ceramic cooking pans
Two opposite things to try, depending on what the haze is (or what works.)


Barkeepers Friend (mostly oxalic acid) or vinegar (acetic acid, not
quite as strong as oxalic.)
Baking soda and water paste (alkaline) or soak in hot water with
baking soda.
Actually, that brings a third to mind - mechanical - Bon-Ami -
feldspar - abrasive but softer than glass (which is what ceramic
glaze is, more or less.)


Default assumption would be that it's a hard water deposit, so start with the acid approach, but all three gives you options if that doesn't work.

Another mostly-mechanical option that won't require shopping for a special cleaning product - try scrubbing with toothpaste.