A substance consisting of Mechanical Grease and Dirt, commonly found on construction equipment. Specifically, found on or around a moving part that contains a joint that uses Grease as lubrication. Overtime Grease is
excreted from the joint and starts to
accumulate around it, dirt will also come into contact with it combining to make a very sticky substance.
It is found in large quantities on skidsteers where
the boom arms are attached to the vehicle, sometimes if the equipment is used enough the arm will over time compact the substance down and turn it into a very dense clay like material that becomes increasingly hard to remove.