I was just looking at the odds of having new key not working in any lock, so cleaning is not going to work.
Regards
Dave
In my case all three of my external key cylinders were gummed up from years of non-use. I had to free-up all of them using the method I detailed. The reason I figured out I had a problem is because I cut new keys and my first test was to see if the new keys would unlock the door. At that time I could not remember the last time I had used a key to enter the vehicle.