There should be plenty of carwashes in the valley that provide this service. Any wash that offers hand detailing will also offer engine cleaning services. Look for the car washes that have a couple of exotics or older restorations getting serviced. Chances are you'll be in the right place.

Drive up Encino Blvd or Ventura Blvd and you'll probably find a full service full detail car wash, but you'll probably find only 24 hour self serve washes on Roscoe Blvd. or Van Nuys Blvd.