In order to avoid the accumulation of dust inside the lock you want to use a dry lubricant.
Door latch grease.
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Squirt a small amount of the graphite lubricant into the car door locks and trunk locks to ensure they keep working smoothly.
Many people put up with the aggravation of a sticking door lock for years.
Realizing this the following section was designed to provide much needed answers to ensure that you purchase the best lubricant possible for your individual situation.
First clean the keyhole with a penetrating lubricant like wd 40.
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If the door squeaks every time you open it the car door hinge could be bound by corrosion.
In general there are two steps that should be followed before lubricating hinges and locks.
Spray a dry lock lubricant such as 3 in one lock dry lube into the keyhole.
Lubricating the door lock.
Insert your key and move it around to spread the lube into the lock.
Fixing a few stubborn locks might involve disassembling cleaning and then reassembling the lock.
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Use the wd 40 for latches and hinges on the glove box and gas tank cover.
Purchasing door lock lubricant.
Graphite is not a good choice since it can get on other surfaces and stain them.
The material of your door lock or hinge will determine the type of lubricants or cleaners that should be used to maintain them.
If so squirt the hinges with wd 40 to free them and move the door several times to work in.
Lube the lock with a dry lubricant.
First clean the hinge or lock with a recommended solvent or an all in one lubricant such as a penetrating fluid like wd 40.
White lithium grease and silicone spray.
Lubricate car door latch.
Purchasing a door lock lubricant can be a bit more complicated than simply purchasing the cheapest product you can find or the lubricant that has the best stats across the chart.
Graphite powder is the preferred lubricant used by professional locksmiths to maintain a door lock.
Lubricate nonmetallic latches like a car door latch mechanism with silicone spray.
Use some silicone spray and work the knob back and forth until it moves freely.
Doorknobs deadbolts and hinges are the main components of a door that need periodic lubrication.
You want to use a silicone based non staining spray to lubricate your locks.