1. Slowly tighten the rusty nut by 1/4 turn, then pull it out, and tighten it repeatedly to loosen it.
2. Hit the screw or nut with a hand hammer to make the rust layer shake and easy to loosen.
3. Soak the screw in kerosene for 30 minutes, then unscrew it.
4. Heat the nut with a blowtorch, and unscrew the nut quickly after heating and expanding. 5. Use a special rust remover.
