Tar and Asphalt Remover (T. A. R.) - T. A. R. dissolves any resin, creosote, crude oil, grease, tar, and asphalt on contact. Once T. A. R. is applied, let soak for as long as needed to penetrate the substance. Then, if needed, agitate with a brush or rag. Once it has penetrated the material, hose off with high pressure washer.