I was working in a existing GE panel, remove breaker and about drop it. I had what seems like machine oil on my hand, alot of the breakers are covered in it with some pooling on the side and at the terminal screw. I checked the wires entering thru the top and everything is dry, there is some oil on one of the feeders but only where wrapped in phase tape. I am concerned about a hazard there is enough to cause a problem. The panel is mainly A/C loads and have know idea what is causing this.