On Friday, November 13, 2020 at 7:07:37 AM UTC+13, Andy Burns wrote:
Owain wrote:
Gib Bogle wrote:

The metal mesh filters in the oven extractor
hood are very clogged up with grease.

Put them with the oven racks in a bag/pouch of Oven Clean.
Unless they're made of aluminium!
I do remember from about 50 years ago the effect of NaOH on Al.
Naively I've been thinking that some organic solvent should deal with the grease, something like mineral turps, petrol or kerosene, but nobody has suggested that.