In this how-to video, you will learn how to remove rust from metal. This is useful if you have rust on bolts and it becomes hard to remove. You can squirt penetrating oil on the bolt in order to easily take it apart. All you have to do is spray it. Leave it for about 10 to 15 minutes. If you still have a hard time, you can use wrenches to do this. You will see that the liquid has penetrated all the way through the threads of the bolt. This is the best way to release any rusty parts. This video shows you how to properly do this.
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