White Baking Chocolate How Do I Remove The Brown Stains From A White Baking Dish?

How do i remove the brown stains from a white baking dish? - white baking chocolate

I have a baking dish, which is a whitish color, and every time I use, seems to get more bits of brown it. I tried scrubbing with steel wool and baking soda, but just do not stain. Has anyone an idea?

Thanks to all who have a real answer