Stumbled over this trick when a very nice customer of mine offered me a couple slices when i was repairing her house, and I had roofing tar on my hands. Cleaned it right Off!
So go out back, and take a slice of nice greasy pepperoni to it.
And if you ever need your house fixed, just remember, the way to a Contractors heart, and probably cheaper bill, is through there stomach!
We can't always agree, but we can still be civil to each other.