SQL Orphan users

select u.name , 'exec sp_revokedbaccess '''+u.name+''''
from master..syslogins l right join
    sysusers u on l.sid = u.sid
    where l.sid is null and issqlrole <> 1 and isapprole <> 1  
    and (u.name <> 'INFORMATION_SCHEMA' and u.name <> 'guest'
    and u.name <> 'system_function_schema')