Determining the "hardest" cleaning job can vary based on individual perspectives, as different tasks may present varying challenges. However, several cleaning tasks are commonly regarded as particularly challenging due to the intensity of effort, skill, and time required. Some of the hardest cleaning job is a matter of opinion, but some of the most challenging include:

• Crime scene cleanup: Crime scene cleaners must clean up the aftermath of violent crimes, such as murder and suicide. This can be a very emotionally and physically demanding job, as it requires cleaners to deal with blood, bodily fluids, and other hazardous materials.
• Hoarder cleanup: Hoarder cleanup involves cleaning out the homes of people who have accumulated large amounts of clutter and debris. This can be a very difficult job, as it requires cleaners to be patient and understanding, and to be able to work in often dangerous and unsanitary conditions.
• Sewage cleanup: Sewage cleanup involves cleaning up and disinfecting areas that have been contaminated with sewage. This can be a very hazardous job, as sewage can contain harmful bacteria and viruses.
• Medical waste cleanup: Medical waste cleanup involves cleaning up and disposing of medical waste, such as needles, syringes, and other sharps. This can be a very dangerous job, as medical waste can contain bloodborne pathogens and other infectious agents.

These jobs require skilled and dedicated professionals who are willing to work in difficult conditions. If you are considering a career in cleaning, be sure to weigh the pros and cons carefully before making a decision.

In addition to the above, here are some other factors that can make a cleaning job more challenging:

• The size and complexity of the area being cleaned: Larger and more complex areas are generally more difficult to clean.
• The type of dirt and grime being cleaned: Some types of dirt and grime, such as grease and oil, are more difficult to clean than others.
• The presence of hazardous materials: Cleaning areas that contain hazardous materials, such as bloodborne pathogens or chemicals, can be very dangerous.
• The need to work in difficult conditions: Some cleaning jobs require workers to work in difficult conditions, such as extreme heat or cold, or in confined spaces.

If you are looking for a challenging and rewarding career, cleaning may be a good option for you. However, it is important to be aware of the challenges involved before making a decision.

In addition to the above, it is also important to consider the emotional and psychological challenges of some cleaning jobs. For example, crime scene cleaners and hoarder cleanup professionals may be exposed to traumatic scenes and experiences. It is important to have a strong support system in place and to take steps to protect your mental health if you are working in a challenging cleaning job.