Rust removal is just the beginning,and depends on the amount of rust.
Small anounts of surface rust,can be removed with a wire brush.
Heavier amounts of rust,can be removed by soaking in a mixture of vinegar and water--I use a 50/50 mix,and soak over night.Remember,vinegar is acidic and the traps must be rinsed completely in clean water.
After traps are cleaned,you need to dye and wax them,or at least wax them,to keep them free of odor.
Tom