Chevrolet Silverado Classic 2007 Owner's Manual page 579

CAUTION:
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Rust or dirt on the wheel, or on the parts to
which it is fastened, can make the wheel
nuts become loose after time. The wheel
could come off and cause an accident.
When you change a wheel, remove any rust
CAUTION: (Continued)
6. Remove all the
wheel nuts and take
off the flat tire.
CAUTION: (Continued)
or dirt from the places where the wheel
attaches to the vehicle. In an emergency,
you can use a cloth or a paper towel to do
this; but be sure to use a scraper or wire
brush later, if needed, to get all the rust or
dirt off.
7. Remove any rust or
dirt from the wheel
bolts, mounting
surfaces, and
spare wheel.
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