Vinca (Periwinkle) Issues

Help! I am having some issues here with Vinca (aka periwinkle).
I have a nice patch of it next to my pool and it is infested with clover. I've been pulling the clover but I can't get ahead of it. Any suggestions? Is there a specific herbicide that will kill clover and not Vinca?
Thanks
Dean
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You mean vinca can be killed with a herbicide?! Just kidding (a little). I've tried to eliminate our vinca from unwanted spots with herbicides and found it to be pretty resilient. My guess is careful spraying will take out the clover with little damage to the vinca.

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