Using a realistic dummy hand, the video graphically demonstrates what happens when you clean your motorcycle chain while the engine is running—showing the chain instantly yanking the hand into the sprocket, shredding it to pieces in seconds. Before this brutal visual, the creator walks step-by-step through a proper deep-cleaning process using chain cleaner, scrubbing tools, microfiber cloths, and lube—let’s watch the video to see both how it’s done right, and how it can go horrifyingly wrong...