Do it all the time,

- warm engine, not hot
- cover alternator (and air intake if. exposed)
- use wide angle pressure washer nozzle
- stay about two feet away
- wet engine
- I use P21S or Griot's engine cleaner (it must stay wet)
- using a water spray bottle and stiff detail brush, work extra dirty areas
- rinse thoroughly
- spray radiators, intercooler, etc. back to front
- drive

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim