I usually washed my previous car's engine compartments with a hand nozzle at a coin-op car wash. I would do it a couple times a year so dust and grease never built up to the point of ever needing deep degreasing. I looked at the engine comparment of the GENIII Prius and see that there seem to be alot of exposed orange (high voltage?) wires that would be better off covered with some kind of plastic engine cover near the drivers isde. It looks naked and some of the orange wires look like they have bare wires exposed on the outside of the tubing where it connects with clamps nearer to the front of the car. I thought my car must be missing the engine cover, but I found pics online that are the same. Are there any problems washing the engine with light pressure of soapy water to wash away the dirt and grease before it accumulates heavily? I don't want to cause damage or get electrocuted.