Greetings Shirley, (& Dodgeman)
Vinyl siding is a petrolium based product, and so is tar.
Anything you use to remove the tar will also hurt the siding.
I would start by trying a cup of bleach in a gallon of water, then I would add more bleach until it worked.
Then RINSE the whole area with water.
If the bleach does not work, I would then try the spirits, sparingly.
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