I second Rico.  PB Blaster is great.  But my personal favorite:   ZEP.  I
love the stuff.  Work any better than the PB Blaster?  I guess not.  At
least, I can't tell.  Don't know how to tell.  : )  But there are many
different forms of Zep, e.g., Zep 45, and the stuff generally is super
strength industrial strong.  Expensive.  I have had several cans for about
5 years.  It doesn't take much!  Funny now, I can't remember the different
types I have on the shelves.  If anyone's interested, I will list them
specifically.  Many different purposes.

hk