I assume it was a rumor started by a graphite company.
Key sticking in door lock wd40.
Remove the connecting screws the faceplate screws and then the knobs.
Press down on the button on the rear of the wd 40 canister to begin releasing the lubricant into the lock.
You can lubricate deadbolts the same way.
Here in the houston area it seems locks need to be lubricated ever now and then.
Slide the key in and out of the lock several times to spread the lubricant.
Lube the lock with a dry lubricant.
Hold the application straw right above your stuck key aiming it into the hole.
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But when i got there wd 40 did.
But in any case i would say it is a myth.
Wd 40 is a great light lubricant for locks.
Next pull out the latchbolt assembly and clean and lubricate the lock as just described.
First clean the keyhole with a penetrating lubricant like wd 40.
You also should use this spray on the front and rear door hinges.
Spray the wd 40 into the lock.
Often if your key is hard to push into the lock spraying some wd 40 into the keyway will allow the key to push into the lock.
If the lock doesn t work smoothly loosen the screws realign the cylinder and latchbolt and try again.
In order to avoid the accumulation of dust inside the lock you want to use a dry lubricant.
You can use a liquid lubricant such as wd 40 if you choose as it will temporarily loosen up the lock so you can get the key to turn.
Just know that over time the liquid lubricants inside your door lock will attract traces of dirt and dust.
Wd 40 works wonders for squeaky hinges and linkages just spray directly onto the affected area.
Use the wd 40 for latches and hinges on the glove box and gas tank cover.
Don t be afraid to use a liberal amount of oil a sticky lock needs the attention.
When any one asks me for advice on what to you i don t hesitate to suggest wd 40.
Don t apply household oil to the key or cylinder because it attracts dirt and eventually would gum up the lock spray the lubricant into the keyhole itself and then spray it on the key.
Hold down the spray button until the wd 40 begins to overflow from the lock opening.
Now wiggle the key up and down not side to side to work it out of the lock.
Squirt a small amount of the graphite lubricant into the car door locks and trunk locks to ensure they keep working smoothly.
Spray a dry lock lubricant such as 3 in one lock dry lube into the keyhole.
I m not sure why people are told not to use it.
Insert your key and move it around to spread the lube into the lock.