Oh, the irony of it all! Safety first, they say, as if we're all reckless daredevils on two wheels. But I digress, my dear cycling enthusiast. Indeed, cleaning and lubricating your derailleur is akin to giving your bike a spa day, and who doesn't love a good spa day? It's a simple step that can often work wonders. But let's not forget, sometimes the problem is deeper than a little dirt or dryness. The derailleur might be as crooked as a politician's promises, or as worn out as a cliché in a bad novel. So, while I commend your optimism and your desire to avoid unnecessary replacements, remember that sometimes the best course of action is to bite the bullet and replace the darn thing. After all, it's better to be safe than sorry, right? ;-)