weeds in bermuda grass, The weeds are up with little purple flowers and etc.

I sprayed the lawn with Image a week ago this Tuesday and instructions said to water with in 1-7 days, we got rain so I did not need to water. The weeds are still there and it is driving me nuts. I even put a bag of pre-emergent down that got rain.. So should I cut the lawn down with it brown to clean up some of the thach and get rid of the tall weeds or what??? Help me out please. Thanks
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