1. Use lubricant: spray lubricant on the thread, wait for a while, and then try to unscrew it.

　　2. Heating: Heat the pipe with hot water or a hair dryer, and then try to unscrew it.

　　3. Use tools: use tools such as pliers or wrenches to clamp the thread and then try to unscrew it.

　　4. Cutting: If all the above methods fail, you can consider cutting the pipeline with a cutting tool.

　　1. You can slightly burn it with a soldering iron, and you can slightly encounter high-temperature melting, and then screw it off. If it is not screwed in plastic, just drop a few drops of lubricating oil and screw it for a while, which is also very effective.

　　2. If you want plastic screws to leave no trace, you can wrap the screwdriver mouth or the blade of the internal wrench with two layers of plastic wrap. However, you should pay attention to the fact that the blade is as tight as possible against the screw to avoid slipping and rubbing, so as not to leave any obvious trace.

　　1. The method is as follows:

　　You can burn it with a soldering iron first. When plastic screws is near high temperature, it will melt, so it is very convenient to unscrew it.

　　2.

　　You can use an internal wrench blade, first wrap a layer of plastic wrap around the blade to prevent the surface of the screw from leaving traces, and then aim the wrench at the screw and unscrew it.

　　3.

　　You can also smear it on the screw with cola, and then unscrew it with a tool after a while.

　　Try to unscrew by force: Sometimes plastic threads are attached together because they are too tight or have not been used for a long time, and it may work to try to unscrew by force at this time.

　　2. Heating: Heat the whole plastic part with hot water or a hair dryer, which will make it soft and release the pressure, making the thread easier to untie.

　　3. Use rubber gloves: Rubber gloves can provide better friction and grip, making it easier for you to unscrew a stubborn plastic thread.

　　4. Use lubricant: spraying lubricant can make plastic material relieve the pressure of fastening buckle and promote the loosening of thread.

　　5. Use tools: use a screwdriver or pliers to unscrew the plastic thread. In case of breakage, new parts need to be replaced.