Summarize the following:
Because the torch will get extremely hot, you'll need the extra length the pliers provide to keep your hand safely away from the heat. Keep a firm grip on the plug, but don't squeeze so hard that you risk damaging the spark plug. It only needs to sit in the pliers as a handle extension. If you have a bench vice, that will work in place of pliers. Turn the knob on your gas or propane torch to allow gas to flow, then either hit the ignition button or place an ignition source in front of the nozzle. The torch will then light up and begin burning. You may choose to wear gloves just to give your hands a bit more heat protection. Turn the torch all the way up so it is producing a blue flame. The torch will burn the carbon and debris off of the spark plug, and because the plug is designed to be inside the engine when it ignites, it will survive the heat without issue. Hold the plug in the flame, rotating it from side to side, until the end of the plug and the electrode are glowing red hot. Depending on how hot your torch is, this may take several minutes. Be extremely careful not to allow the flame from the torch to reach anything else in your work area. After the plug gets hot enough to burn away the carbon, it will need to cool for a few minutes before you can work with it. Be extremely careful; the spark plug will return to normal colors long before it is cool enough to touch. To be safe, give each plug at least 5 minutes to cool before attempting to reinstall it. Once the spark plug is cool, it will be clean enough to reinstall. Once the spark plug is cool enough to reinstall, put it back in, reconnect the spark plug wire, and move on to the next spark plug. Continue to repeat these steps for each plug until they are all clean. It is important that you clean each spark plug so that some cylinders don't burn more efficiently than others.
Grip the spark with pliers on the end the wire connects to. Put on gloves and ignite your torch. Hold the end of the spark plug in the flame until it turns red. Let the plug cool and do not touch it with your fingers. Repeat the process for each spark plug.