Wayne,
This is right off the wall, but I've used an air powered "flux chipping hammer" for stuff like what you're looking at. Its made for chipping welding flux, with a chisel about an inch wide but makes other stuff move pretty well. I would guess it would work best with cold or frozen tar because the tar starts to act like glass and will shatter from the impacts.
I've seen similar tools with wider blades made specially for uprooting linoleum but you might need a bigger air hammer to drive them through tar. Your local tool rental shop might be your friend here to find out what works for you before you buy anything.
What kind of of price upgrade are you looking at for cleaning? The stainless from appliances is pretty low grade so the yards will lowball you....as you are seeing....lowballing right to shred price! Are there any other yards around who might play ball with you on the washers with the tar left in them?
Jon.
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