Thanks guys for your advice. I asked a guy from Novus who was buffing a tag on a shop window, he recommended taking the tank into the work shop, easier said...(325L tank)!
I must say though, at the time Ira's three step solution would've been quite appealing, lucky she's so cute and i love her so much.
I'll check some other glass companies and then the Brasso.
What about baking soda or Ajax "Tough on grim no harsh scratching"
Barrie, you sound like you do this quite often, are you in the trade or just lots of kids? lol
Thanks again