I bought this when I moved into a house with a hard to turn deadbolt. My dad told me about this type of product a long time ago so I tried it and it worked great. I blew on the lock a little and it turned easily. I've used it on doorknobs and car doors ever since. The only complaint I have is that the hole gets clogged easily and I have to put something in it every time to remove it, but it wasn't enough to get the star off.
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