what a bargain!
congrats to this nice machine.
Whether it is a bit nonchalant what comes to the aluminium shine or whether you can manage to get it polished up: You need the tools. Try to get at least the renovator/shampooer thingy, the zip brush and the tool caddy.
The G6 is one of the most effective Kirbys around (IMHO even outcleaning the Sentria as that one does a lesser good job on crumbs, grains and sand = particle based grime). Besides I just love the black colour pattern, fried pumpkin (Sentria) just isn't up to my liking, but that is a matter of personal taste.
Have a heart and get it some polish, the G6 is one of the most modern and truest friends you can have.
A shy beast, if you will. Try to get it complete. (please, you won't regret it).