M.H.
Cut the straps, write on it do not use and not safe for use. Destroy the cover. Just throw everything in the garbage once it's been destroyed.
**DO NOT DONATE IT**
A car seat that is 8 years old may have weak plastic that will not keep a baby safe in a crash. The straps could also be weakend over time. This video shows a crash with an expired car seat.
http://www.youtube.com/watch?v=wvCRz7BRAM0