Maintenance of Hoover Senior 625c

[paulb532]

I am looking to buy a Hoover Senior on eBay (if you're selling let me know) to go along with my Junior 1346a. However the condition of the motor casing differs on the ones on sale. Can anyone give me advice on how easy these are to polish back to a good condition and/or polish out scuffs and scratches?
I dont want to miss out on buying a great example because it looks scuffed when it might easily polish up. ☺
Thanks in advance.