Bottlebrush - after bloom?

After bloom, how should I deadhead - or should I?
This is a healthy, vigorous plant that produces beautiful blooms. I haven't had a bottlebrush for decades, since my friend's dog ripped up my plant, so I've forgotten how to deal with the blooms.
Cut back? How far?
This Australian Website
http://www.anbg.gov.au/callistemon /
is informative, but having perused the "Bottlebrush as Garden Plants" and "Pruning"sections, I'm still unsure.
Any real world experience out there? Taking into consideration that I'm Zone 24/8 -- So. Calif Coastal.
TIA
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