Chevrolet HHR 2010 Owner's Manual page 384

WARNING:
{
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 changing a wheel, remove any rust
or dirt from places where the wheel attaches to the
vehicle. In an emergency, 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 6-84.
6-90
5. Remove all the wheel
nuts and take off the
flat tire.
7. Place the compact spare tire on the wheel-mounting
surface.
6. Remove any rust or dirt
from the wheel bolts,
mounting surfaces
and spare wheel.