The best way to get rust stains out of your clothing is by using a lemon. Lay your shirt on a flat surface on top of a towel and cut your lemon in half. Squeeze the juice onto the rust stain and then lay your shirt in the sun and allow it to dry. If the stain hasn't lifted, repeat the process and if it has, just launder your shirt normally. See cleaning.lifetips.com/cat/7405/stain-removal-from-clothes/index.html for more details.