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