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Seems like a good pressure cleaner would get that stuff off. Steam and pressure would be even better. It could be old cosmoline which is like a sticky wax.
You'll have to get under there and take some time spraying, wear safty goggles, you'll be wearing alot of the crap when you're done.
Or just go over it with new puff cans of black undercoating spray. If you do that, buy name brand stuff like 3M or Wurth so it goes on nice and lasts.
If you do it in your driveway, drive the car onto a tarp to collect the overspray first.
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