WD40 works well to loosens grease and grime. Need rubbed in with hands or brush to get things going. Thick stuff will have to be scraped with screw drivers and putty knifes and wire brushes. I have an air driven needler from HF. What an amazing tool for hard pack grease in tight spots.
http://www.harborfreight.com/catalogsearch/result?q=needlerDon't turn someone applying gas from a plastic bottle by squirting (directional pouring) 6 ounces of gas on a motor, or paint brushing it on, way out under a tree, as creating fumes that will blow. The people who catch fire are in a one car garage with a natural gas water heater, smoking a cigarette and cleaning a carb in a one gallon bucket of gasoline on the floor. 700 billion auto, tractor, lawn mower, boat.... gas tank fumes are vented into the air all day, every day. Approximately.
