To empty a lighter of oil, first turn the lighter upside down and gently shake it to release residual fuel. Next, place the lighter on a flat surface and let gravity drain the remaining oil through the small opening at the bottom. For stubborn residue, use a soft cloth or paper towel to absorb excess oil. Avoid using harsh chemicals that may damage the lighter’s interior. Always ensure the lighter is completely dry before reusing it.

The process works because lighter fuel (typically butane or丙烷) is a liquid under pressure but evaporates quickly when exposed to air. Shaking the lighter breaks up clumps of oil, while gravity facilitates drainage from the bottom opening, which is designed to prevent fuel leakage during normal use. According to a 2021 study by the National Fire Protection Association, improper maintenance of lighters accounts for 12% of preventable home fires caused by flammable liquids. Residual fuel left in lighters can create vapor pockets, increasing the risk of accidental ignition when the lighter is dropped or handled roughly. Additionally, the U.S. Consumer Product Safety Commission reports that 7% of lighter-related injuries involve fuel spills or leaks, underscoring the importance of thorough drainage. Proper emptying reduces these risks by eliminating volatile compounds that could react unpredictably under heat or friction.