The tar has been on the carpet for four months
I once got tar on my feet at the beach in Miami, and lo and behold, in the hotel's little store they had a product called Tar Off. Worked wonders. Go to any home supply store and they should have something for you.
There is a poduct called Goof-Off. Works for tar, gum, paint, and other sticky type things. It works well, and doesn't have too bad of an odor. It is nice to keep around the house. Comes in an orange spray bottle and is pretty easy to find.
Rubbing alcohol may work to remove the remaining stain. Pour a little directly onto the stain and blot with a clean dry cloth. Once the stain is lifted, blot again with a damp cloth. Lighter fluid also works much in the same manner to remove greasy stains such as tar, but take care when using this method. It should go without saying that lighter fluid, as well as rubbing alcohol and other flammable agents, shouldn’t be used near fireplaces, wood burning stoves and other sources of heat and flame. WD-40 has also been proven to remove tar from rugs and carpets. Spray a little on and let sit. The tar should lift right off with a little gentle rubbing. You can also try making your own cleaning solution. In a spray bottle mix one part mild dishwashing detergent and one part of warm water. Saturate the stain and let sit for an hour or so. When time is up, keep blotting with a thick, dry cloth until the stain is lifted. If a yellow mark remains after your remove the tar, try some hydrogen peroxide but remember, it’s bleach so be sure to test first to make sure you’re not creating an eyesore. Once you’ve completely removed the tar from the carpet, rinse the stain with lukewarm water and blot dry.
