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Interesting...we have mice up the wazoo, (a US technical term, lol!), and they have not managed to break into the interior of our '01 X, yet. But, if there is a tiny hole, less than thimble size, they can squeeze in...or, they can chew through almost anything other than steel.

The 'stuff' around the mummified mouse is simply 'residue' from off gassing and particles coming off, as the body shrinks; we find that 'halo effect' on long dead mice here, frequently.

Some Febreze brand spray or Febreze Pet Odor Eliminator will mask the smell, though you may not have that brand in China.
Febreze: Select your country

That mouse may be a solitary; put in a sticky trap a few consecutive overnights, baited with peanut butter or bird seed to see if he has any buddies. And, I hope none got into your HVAC tubes: we had them nesting in my wife's old POS Honda CRV and it smelled like Jeffery Dahmer's closet.
GL, mD

Don't forget to wear a respirator and gloves when handling mice or cleaning up mice poo. Hantavirus is not a good thing. Protect yourselves!

Hantavirus; jeez. Sounds like something outta Contagion! :nervous: