On Fri, 30 Oct 2020 13:23:04 -0000 (UTC), Jethro_uk wrote:

Over a period of time a non-stick frying pan has gradually
accumulated
more and more carbon.

Not really non stick then, is it ?

He he, my initial thought as well.

Hot soapy water, non-scratch scourer and a bucket of elbow grease
will shift it. Mechanical removal is the only thing I've found
effective against carbon. No, I tell a lie the other effective way is
to wash the pan after very use and not let carbon build up in the
first place.

--
Cheers
Dave.