What does work is heat under pressure. Steam.
A friend showed me how she did it, with the Steam Cleaner PRO V2 from Achaté. I was sceptical, because I already had plenty of gadgets in the cupboard that never lived up to their promises.
But when I used it myself, I saw the difference straight away.
The steam cleaner works with a steam pressure of 3.5 bar. That heat loosens grease, limescale and residue, so you simply wipe it away instead of scrubbing it off. Just water and steam, no chemicals. And the steam comes out powerfully yet in a controlled way, without leaks or hassle.