Which parts and parts of the chiller need to be cleaned and cleaned?

There are many places that need to be cleaned up and cleaned, including oil separation devices, even compressors and refrigerant pipes, chilled water pipes and water tanks and cooling water pipes of ice water machines, etc. (Note, because chilled water tanks and chilled water generally do not touch the outside world , So the possibility of cleaning is not high), all need to be cleaned and cleaned, as well as maintenance.