I've got a 8.75 house that is all rusty and scaly on the inside. I can wire wheel the outside, but what the easiest way to clean out the inside to get it ready for assembly??? The local machine shop wants $40 to hot tank it. Will hot tanking it get rid of the rust and scale? Would it be worth the $40??? Can I pre-treat it with something to make sure to comes out clean????

Any ideas????