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I've used mineral spirits in the past, but have found that Goo Gone works well also. If it is really thick tar, you have to apply it over and over several times. Saturate a cloth (or paper towel) with either product and work into area and then wipe with a dry, clean cloth (or paper towel). When done, wash and wax the area because Mineral Spirits and/or Goo Gone will remove wax in the process so it has to be rewaxed. Waxing the area makes future removal of gunk easier.
I've tried a clay bar (and associated lubricant) on this and it works too, but the clay bar gets contaminated much faster.
Next is this baby oil method!
I've used goo gone in the past and was too aggressive!
no matter what is used to remove tar, a good coat of wax afterwards is recommended.
Goof Off is pretty harsh, but Goo Gone is plant based and works great on plastic without damaging it. It removes stickers really well also. The trick is to apply it with one paper towel or cloth and then wipe over it with a separate clean paper towel or cloth. When it comes to tar, it is labor intensive no matter what you use.