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Take off the fabric car seat cover and padding, using scissors to cut away areas attached to the plastic. Cut the straps and remove them from the rest of the car seat. Remove as many metal pieces from the plastic base as possible with a screwdriver. Some pieces may be difficult to remove, but try to remove all the metal pieces if you can. This will deter people from taking your car seat from the curb and trying to reuse it. The remaining plastic seat should be marked so that people will not try to take it from your recycling pile to reuse. With a permanent marker, write the words "EXPIRED" or "UNSAFE" in large letters on different sides of the plastic car seat base.

Summary:
Remove all fabric, padding, and straps from the car seat. Use a Phillips-head screwdriver to remove metal pieces. Mark the bare plastic car seat as EXPIRED or UNSAFE.