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my sessions not getting cleared on logout

hi ,
My problem is that my sessions are not getting cleared when i do logout from salesforce . My application
sessions remains same even on logout . My old check for clearing sessions was for another session id but now salesforce create new session id for every tab click now i can not do session clear for new session id . Now i clear my session for another userid . But if the same user do logout and login again session remains same .
Please anyone is having any suggestins how can i clear my session on logout ??
Thanks ,