mme on "Hiding Elements for other admins"

Hi,

I am trying to hide certain admin elements for other administrator users as I am trying to get rid of any items they should not need to simplify the backend

This what i have so far but its not working

global $current_user;
if($current_user->user_login != 'webmaster')
{
  // Do stuff here

}

This is put into a custom plugin it hides everything I need but it seems to ignore the user 'webmaster' is well and also hides the elements.

Any suggestions on why this is not working?

Thanks in advance