It seems these things got way better lately and I was wondering what makes it possible.
If you use the right solvent something that would be impossible to clean with the wrong material will become trivial with the right one.
There are also acid solutions that work in a different but similar way. When used appropriately they will dissolve and transform material X into material Y that can then be easily cleaned because it won’t bind to the “surface” anymore.
Applied sciences channel on YouTube has a couple videos about cleaning and solvents. It’s worth checking him out.