How to care for a parakeet?

I have a parakeet and she preens all the time. I have sprayed her with mite and lice spray and I have a mite/lice can hanging on her cage. I clean her cage twice a week and keep her water dish full of clean water. Am I caring for my parakeet correctly? What else can I do to keep her clean…oh, she does enjoy bathing in my bathroom sink under a trickle of running water. Any help would be greatly appreciated.
- bigb252