Actually not far off you will I suspect find its carbon down to the metal.
I think these devices get localised heating as they get old and this cracks
the non stick and then its only a matter of time before the inevitable
happens. New pan is probably the only solution or you will be scrubbing it
for ever until the element or thermostat dies.
Brian

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"Gazz" wrote in message ...


"David WE Roberts" wrote in message
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O.K. it shouldn't be there.

Google hasn't given me much help.

I am trying the soaking in a biological washing liquid, but this doesn't
seem to be shifting it very much.

Has anyone a good method of cleaning accumulated carbon off non-stick
frying pans to restore the non-stickability or at least reduce the
stickability?

angle grinder?