I've had an idea of speeding up the process of breaking in by putting some volcano ash into the cube.
I immediately grabbed my sulong which I never use (so no regret) and put a pinch of ash on edge and corner pieces. Unfortunately I was too excited to take photos before I did it so I can't present you the difference. What exactly happened? The cube slowed down and became extremely cruchy and slow. No corner cutting at all. After 5 solves the ash was equally spread and the cube became a bit faster, but not as fast. 50 solves later it looked like 5000 solves old. LArge amount of grated plastic were fallling from the cube, when I was solving on a black table it looked like dandruff

I washed it in water and used a toothbrush to get rid of the remains o ash. But it's not possible. little black grains are just encased in the plastic and the cube still wears off 10 times faster than normally. Also, no lube helps to speed it up. It's simply as slow with any kind of lube as without.
Conclusion?
Don't do it.
Just don't.