GMC 2008 Canyon - Manual (Page 348)

7. Remove all the wheel
nuts and the flat tire.
{ CAUTION:
Rust or dirt on a wheel, or on the parts to which
it is fastened, can make wheel nuts become
loose after time. The wheel could come off and
cause an accident. When you change a wheel,
remove any rust or dirt from 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. See
Changing a Flat Tire on page 5-80.
8. Remove any rust or dirt
from the wheel bolts,
mounting surfaces
and spare wheel.
5-88