GMC Sierra Denali 1500 2023 Owner's Manual page 417

416 Vehicle Care
Reinstall by lining up the floor liner insert
button clips over the liner retainers and
snapping into position.
Make sure the floor liner insert is properly
secure in place using all button clips.
Verify the floor liner insert does not
interfere with the pedals.
Cleaning Rubber Floor Mats (All-Weather
Mats and Floor Liners)
See Vinyl/Rubber under Interior Care 0 412
for important cleaning information.