Cookies issue in mautic

Your software
My Mautic version is: 3.2.1
My PHP version is: 7 +
My Database type and version is: 5 +

Your problem
My problem is:
Hello Everyone,
Can any one guide me how i can delete cookies after logout. please help is there any function in mautic.
issue i am facing:- because cookies are not deleting so whenever i am signup with other account it will over-ridding the previous data And i think it is happing because cookies are not deleting.
Can someone help me on this.
its a production issue please help
Steps I have tried to fix the problem: tried to delete that but not able to do it