The basket occasionally went in the dishwasher which cleaned the surface, but the well gunked grease has been building up.
Tried soaking the basket in soap and hot water. Scrubbing with a soft sponge. And then running the dishwasher multiple times but it only got a small part of the grease out.
The blue sponges that ate for non stick are softer than the normal green ones. The rough side of the blue ones are safe for non stick assuming your aren’t giving it everything you’ve got.
These ones: