Harry Bloomfield, Esq. wrote:
Anyone have any idea what might remove burnt on olive oil please. I
need to clean an air fryer. Hot soapy water will not touch it.

My general tool for stubborn greasy things (although not actually
carbonised) is laundry detergent, preferably biological. Put it on neat,
ideally keep it warm warm place (mimicking the 40C of the washing machine).
Leave for half an hour, rinse thoroughly.

Theo