with all the electronics in the Karma, I would strongly recommend NOT power washing the engine. I clean mine with a damp cloth sometimes with a little grease cleaner on the cloth. Power washing a "modern" engine could create a host of problems that will be impossible to diagnose.
Thanks Everyone. My main reason to ask how to clean the engine was because I am taking the car to a local car show here in Fresno, CA tomorrow. And the engine was really dusty.
Here where I live in central ca (Fresno, CA) it gets very dusty in the summer time because of all the ag land around us.
Damp rag, microfibre. Then i finish off the rubber and plastic with a light, light coating of tire shine, but only once I get to the car show. Our Karma won third place last year in San Diego, with no modifications. Speaks to the styling by Mr. Fisker!