urgernt cage help please!!

[russblaxr9]

ok so im buying a cage off craigslist today it was prevously used for fish i know i have to clean it out really well.so what should i use to clean it with . also it has a black back what ever that is i was just wondering if that is ok or i can just peel it off or something i will put up a pic so you can see the back of the cage(ps im just buying the tank)

thank you please respond soon

 

[zebraflavencs]

1 cup lemon juice to a gallon of warm water.
Janie.