GMC 2007 Sierra 1500 Pickup Owner's Manual page 576

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 a time.
The wheel could come off and cause an
accident. When you change a wheel,
576
6. Remove all the
wheel nuts and take
off the flat tire.
CAUTION: (Continued)
CAUTION: (Continued)
remove any rust 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.
8. Install the spare tire.
7. Remove any rust or
dirt from the wheel
bolts, mounting
surfaces, and spare
wheel.