Good reminder. Last year I decided to shoot my S&W CS9 that I had been carrying for quite a while. It had never failed on me. But this time it did. It "jammed" after every shot, with the slide not going all the way forward. It didn't look too dirty, but had enough there to impair the function. Definitely a wake up call for me. I alternate between my S&W CS9 and my S&W 5906, but I now make sure to clean and lube every couple of months or so. Lubed up the 5906 this weekend .... after some plinking.