Either spray it down with a hose (soap not necessary) or go through one of those automatic car washes that also has undercarriage wash as an option. Personally, I prefer the latter because I prefer the high pressure wash to get all of the salt out of the crevices (sp?). Of course, you could buy what some already have: a high pressure washer for the house. The only reason why you would want to wash the underside is to get rid of the salt they spray on the roads to keep from getting excessive corrosion from occuring.
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2000 Silver Ice SE 4X4 Auto
http://albums.photopoint.com/j/AlbumIndex?u=1406935&a=10805120 [This message has been edited by killerx (edited 02-14-2001).]