How do i clean the boot cache

Computer does not boot as fast as it once did. I was told i could try to clean the boot cache, but I'm not sure how its done. Any help would be nice.
Thank you

See:
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
Speeding up Macs,
Macintosh OS X Routine Maintenance,
Essential Mac Maintenance: Get set up,
Essential Mac Maintenance: Rev up your routines,
Maintaining OS X,
Five Mac maintenance myths, and
Myths of required versus not required maintenance for Mac OS X for information.

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