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					Originally Posted by  Destroyer
					 
				 
				WD-40 and PB Blaster are both considered penetrating oils.  Kroil, if you can find it, is also a great penetrating oil. 
 
Once you get that issue resolved, replace the end nut on your engine thru-tube where the cable goes with a Steersman nut.  This will allow you to grease the end of the cable where 90% of the corrosion/rust takes place and keep it from happening.  Also, carefully inspect your steering cable outer jacket for any cracks or cuts or basically any holes that will allow moist air and water onto the metal cable inside.  those will kill a steering cable faster than anything.  Carefully run your hand along the plastic sleeve feeling for any bumps or swelling.  If there are any, that's where the rust and your problem will be. 
			
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 I've actually read that the best penetrating oil is a 50/50 mix of ATF and acetone. I've never tried it though. I've had good luck with grease and starting fluid in a pinch.