I just visited San Jose Auto Steam Cleaning to have 16 years of caked on oil and grime completely removed from the underside of my 80. It looks show room clean... just off the assembly line clean. It's a must if you're 80 has been leaking oil (pretty much all of them are). If you're in the area, I highly recommend checking them out http://www.sanjoseautosteamcleaning.com/. Extremely impressed with the service and nice people too.
Mike
Mike