Don't know where you live but in the states, you can buy a product called
Dip-It. Sometimes it's with the cleaning supplies sometimes with the coffee
supplies. Removes stains from cups, pottery etc. I've been using it for 30
years to get the corning back to "new" after using it a cople times and it
getting stained.. Worth a try in you can fine it.
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"Corningware" > wrote in message
oups.com...
> My friend accidentally left a Corningware casserole dish(white) in the
> oven at 400 degrees for six hours.
>
> She was roasting vegetables and garlic in olive oil. Needless to say
> the dish is a mess with burnt on stains that cannot be removed by
> scrubbing etc. It was completely black after charred remains of the
> vegetables were scraped off.
>
> I have tried many things but alas this sentimental dish seems to be
> dead. The black and brown stains seem to be painted on.
>
> I can send you a pic. It's pretty ugly.
>
> Can you help?
>
> Thanks
>
> Cw5k
>