Cleaning liquid is a miscellaneous item.
Cleaning liquid, along with water, can be used to clean dirty or bloody clothing. Over the course of the zombie apocalypse, clothing will become dirty and bloody, which is dependant on the player's activities. If the player is wearing dirty or bloody clothing over an open wound, the chance of infection will increase.
Cleaning liquid can generally be found in kitchen counters.
From newitems.txt (Project Zomboid directory/media/scripts/)
Weight = 0.3,
Type = Normal,
DisplayName = Cleaning Liquid,
Icon = Cleaning Liquid,