Pontiac 1993 Sunbird Owner's Manual page 186

I
Foreign Material
Calcium chloride and other salts, ice
melting agents, road oil and tar, tree
sap, bird droppings, chemicals from
industrial chimneys, and other foreign
matter can damage your vehicle's finish
if they remain on painted surfaces. Use
cleaners that are marked safe for
painted surfaces to remove foreign
matter.
4
Finish Damage
Any stone chips, fractures or deep
scratches in the finish should be
repaired right away. Bare metal will
corrode quickly and may develop into a
major repair expense.
Minor chips and scratches can be
repaired with touch-up materials
available from your dealer or other
service outlets. Larger areas of finish
damage can be corrected in your
dealer's body and paint shop.
I
Underbody Maintenance
Chemicals used for ice and snow
removal and dust control can collect on
the underbody. If these are not
removed, accelerated corrosion (rust)
can occur on the underbody parts such
as fuel lines, frame, floor pan, and
exhaust system even though they have
corrosion protection.
At least every spring, flush these
materials from the underbody with
plain water. Clean any areas where mud
and other debris can collect. Dirt
packed in closed areas of the frame
should be loosened before being flushed.
Your dealer or an underbody vehicle
washing system can do this for you.
Chemical Paint Spotting
Some weather and atmospheric
conditions can create a chemical fallout.
Airborne pollutants can fall upon and
attack painted surfaces on your vehicle.
This damage can take two forms:
blotchy, ringlet-shaped discolorations,
and small irregular dark spots etched
into the paint surface.
Although no defect in the paint job
causes this, Pontiac will repair, at no
charge to the owner, the surfaces of
new vehicles damaged by this fallout
condition within 12 months or 12,000
miles (20 000
km)
of purchase,
whichever comes first.