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.
This is probably going to be an unpopular opinion, but here it is anyway. If it doesn’t come off with dish detergent and a scrub sponge, just call it a permanent seasoning and let it be. If scrubbing it like mad won’t make it come off, then it won’t come off if your food touches it.