I don't believe the wash had anything to do with it... unless you were spraying copious amount of water into the intake. My first guess is that your AOS went kaput. The first thing I would do is remove the tope AOS hose... give it an examination... see if it has a LOT of oil in it. A little is ok... a lot... I'd then pull the throttle body and see if it isn't flooded with oil. That may explain the no-start issue. Worst case sceanrio... you sucked a bunch of oil into the engine... and that'll require correction.
Do some searches on "white smoke 986 Boxster"... "AOS failure 986 Boxster"... you'll find of lots of information.
Keep us posted. You'll get through the hiccup.
