I've been using the Liquid Key for over 35 years. It really works. Penetrates rusted joints, frozen bolts, etc. PATIENCE IS REQUIRED. It takes time to get into a frozen joint. Wait an hour to a day. Sometimes tapping the joint seems to help. (Or maybe it just soothes irritation :-) Place a rag/paper towel under the joint to catch any extra drips. If it works, it's a miracle. Unscrews easily. It's important to recognize when it hasn't worked, too tight to penetrate. Don't break anything with too much effort! My dad first taught me how to use this thing. (I move his last container).