Of possible relevance, and for info please
How long does it take to clean a runway landing sections (each end) of rubber deposits? Is it an expensive operation, and is expertise generally available around the world.
And has this cleaning been done on the main r/w at Congonhas since the accident? (I presume the r/w is back in use)
There are a lot of black and slippery (when wet) runway ends in Europe, especially at certain Greek islands, which have concerned me in recent years.