GMC 1994 Sonoma Owner's Manual page 285

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 Callout.
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, GM 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.
This applies only to materials manufactured and sold by General Motors.
Bodies, body conversions or equipment not made or sold by General Motors
are not covered.
Appearance Care Materials Chart
PART
NUMBER
I050 172
1050173
1050174
10502 14
1050244
SIZE
DESCRIPTION USAGE
16 oz. (0.473L) Tar and Road Oil
Removes old
Remover waxes, polishes, tar
and road oil
16 oz. (0.473L) Chrome Cleaner
and Polish
I6 oz. (0.4731;) White Sidewall
32 oz. (0.946L) Vinyl Leather
Ti re C1 eaner
Cleaner
16 oz. (0.473L) Fabric Cleaner
Removes rust and
corrosion on
chrome and
stainless steel
Cleans white and
black tires
Spot and stain
removal on leather
or vinyl
Spot and stain
removal on cloth
and fabric