Use any of the following techniques to get rid of your wanted level:
-Just enter a safehouse and save your progress. When you wake u,p your wanted level will be gone. -Enter a marker for any mission. -Enter a police vehicle, then quickly activate a vigilante or most wanted mission. -Get outside of the active radar zone and call a friend. If you reach someone and not their voicemail, you will get rid of your wanted level as the police are closing in.