Clean laptop with compressor
At first I did not believe it, but it actually helps. Main notebook still lives after that!
Just hold the compressor pistol against the louvers of the laptop (not straight, but slightly to the side, so that you do not get full pressure on the fan), then start slowly.
As I said, not with full pressure on the fan. This one should not go crazy.
After that he is much quieter again.
The same thing works with the keyboard.