On my ultimate branding when a user is logged in i can see

Hello,

On my ultimate branding when a user is logged in i can see a home icon in the admin bar and then next to it the name of my site. this is a menu item that drops down and then shows a 'dashboard' link. i want to remove this as i do not want any of my users to have access to the internal wordpress dashboard.

any ideas on how i could do this please?

Thanks,
Sunny