To use:  Shake can well.  Spray engine or dirty part.  For best results let degreaser penetrate and work for 10 minutes, then flush off thoroughly with water.  Repeat if necessary.  In severe cases, loosen and remove excess grease, oil, tar, and sludge with a scraper or putty knife to minimize the use of the product.  Works best on warm engine.  Use on a regular basis to prevent damaging buildup of grease, dirt, oil, and grime, which can cause engine to run hotter.