T.C.
So, I just googled your question and found a fantastic website! (thanks for the question!!) It is here: http://cleaning.lifetips.com/cat/7405/stain-removal-from-...
From this website, I found this info:
You Can Remove Tar From Clothing
The most important thing to remember if you get tar on your clothing is to make sure it is not exposed to heat – such as a dryer or iron.
When you get tar on your clothing, freezing the tar is one of the best methods you can use to remove it.
•Place ice cubes into a plastic bag. The amount of ice you place in the bag should match the size of your tar stain. For small stains you can use a sandwich bag. For large stains you can use a freezer bag.
•Lay the stained clothing on a flat surface.
•Place the bag of ice onto the tar stain. This will freeze the tar and make it harden.
•When the tar is completely hard, peel it off of your clothing.
HTH!