Enemies
The Cleaners are former New York City workers (Garbage men, janitors, custodians, etc.) who lost everything during the outbreak. They are convinced that the only way to save the city from the virus is to burn everything down, including the people still living in it.
Cleaners can appear in many locations throughout the city and can be very dangerous. They are armed with flamethrowers as well as normal Weapons. If you allow them to get too close to you the flamethrowers will deal a lot of damage to you very quickly.
They have a weak spot though. Shooting the fuel tanks on their back from range will ignite and after a few seconds cause an explosion. Taking out the cleaner in one go and, if you are lucky, damaging other enemies close by.