A sticking door lock lever, a key hard to turn in outside lock, doors hard to close and sticking door handles can all be solved by removing and cleaning your door latch. The original grease used in the latch has dried up and isn't lubricating the linkage anymore. It will be impossible to clean the latch in the car because some of it needs to be disassembled after removal. I'll show you how to remove the latch from the car and how to take it apart for cleaning. A few minutes of preventive maintenance will last for many years and protect your irreplaceable parts.