Begin by heating one corner of the marking with a blow dryer, heat lamp, hot water or heat gun until hot to the touch. Pick up an lift that area you just heated (use a razor only on glass surfaces). Slowly begin pulling back the decal, at less than a 90 degree angle. Continue applying heat to the area just before the area that is being removed. Once you have removed the marking, check to make sure that all of the adhesive residue has been removed. Remaining residue may be removed by using Isopropyl Alcohol (rubbing alcohol).