not much:
- remove power cord,
- take out the battery,
- optionally remove some mechanical parts (e.g. keyboard) but make sure this does not interfere with warranty conditions...
- turn the notebook so remaining fluid can run out
- comment by churnd: if there is residue built up on internal components, you'd need to take them out & rinse them off with distilled water, then let them dry completely.
- You can pat them dry with a lint free cloth, but best to let them sit for a few days
- you could carefully dry with a hairdryer...
- and be patient(!) until all fluids are dry...
then check if it is still working.