Hi There.  I just use a low pressure garden hose with a nozzle on it 
to produce a small gentle spray, an old chamois and a bucket of soapy 
water.   Rinse, and chamois dry :)  I wash it every spring, and wipe 
the compartment down at every oil change to minimize buildup.  I keep 
water away from the ignition system, and electricals in general.  
Even the engine lid comes out nicely.

If you have a greasy engine, you might want to try an engine 
degreaser or that Citric Orange stuff.... that works pretty good, but 
slower.... I use that on my bike chain with reasonable success.

Hope this helps,
Harry.

> Now that spring is almost here, does anyone know a good procedure for
> washing the waterboxer engine.  Is a high pressure hose safe?  Can you
> use engine degunk?
> Thanks,
> Lloyd Perkins      dad@together.net
> 
> 
Harry Yates, Langley, British Columbia Canada
'90 Syncro Westfalia   WWW - http://syncro.cr.bcit.bc.ca/hyates
'87 Golf Diesel        email:  hyates@bcit.bc.ca
'91 Miata (Millie)