It’s usually not possible without destroying the litho. Most rust originates behind the litho on the tin and eats through the litho. If it is a rust stain or transfer rust, it should wax or wash off. You can use Plastix car polish. I have found it to be gentle on litho.
Some rust happens because of a scratch or abrasion to the litho. You can sometimes clean the rust off around the damaged area to improve the appearance.
George