The price you pay for living where salt is used on the roads.
I have a 1989 Probe that I bought new and had for 20 years without a hint of rust or corrosion.
One week long trip to Dayton, Ohio in Feb 2009 saw to that.
I even stopped at a spray off car wash on the way home and hosed 'er down real good, to no avail.
Now the engine looks like crap and I can't clean it up.