dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

    NSURLCache * cache = [NSURLCache sharedURLCache];
    [cache removeAllCachedResponses];
    [cache setDiskCapacity:0];
    [cache setMemoryCapacity:0];
    
    NSHTTPCookie * cookie;
    NSHTTPCookieStorage * storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for(cookie in [storage cookies]){
        [storage deleteCookie:cookie];
    }
});