or antiinhibitor....:)

The stuff Americans don't seem to get: Rust Check or Krown, also known as
the "drippy" stuff.

Rust is a tough opponent, especially in colder environments.   The
sand and grit bounce from the wheel and scrape protective layers off.
The saltwater brine-spray does the rest.  In these areas, the best
idea is to wash the metallic undersides with water or regular surface
cleaner,  and dry as soon as possible, especially in the spring.  This
keeps the salt off, and keeps the undercarriage from rotting.  

I do this every year on my 11-year old car and it's only starting to
show the earliest signs of rusting.  A family member has a newer car,
same make/model, and never washed the undercarriage.  Both
side-undercarriages, on the newer car, are completely rotted away
(luckily it has red paint, which blends in with the rust, but nowadays
NJ DMV is unforgiving with obvious rust damage).  BRING ME MY RED CAR!
(brown pants later)...little joke :)

Dan
metro mod page:
http://home.ptd.net/~vstevans/web/car/metromods.html