Used Cages

[Kelsification]

Hi, I'm looking into getting a larger tank for my kingsnake and the possibility of dividing it for future reptiles and unfortunately do not have the $100-$500 to spare for a brand new enclosure for him.

I do, however, have a friend who has a ton of extra tanks from when he kept fish and other reptiles. The tanks, though, were used for years and at this point have NOT been used for years and I doubt they've been cleaned out but I am unsure.

Is it safe to buy a used cage like this? Is there a sure and safe way I can clean and/or disinfect before moving my animal(s) into the cage?

Thanks!