Littlest Pet Shop Titanic How Can I Get The Rust Off Of My Littlest Pet Shop?

How can I get the rust off of My littlest pet shop? - littlest pet shop titanic

Now I play with my toys Littlest Pet Shop in water, and were rust. Some rust outside but not much. And I am worried about cutting into them, because they are alive, and I do not want it to end.

What should I do?