This might be the dirtiest bike chain in the world. It's done 2,500km over three years with absolutely zero cleaning, just more and more lube piled on top. But can it be saved? We're putting it to the ultimate test with three different cleaning methods to see which works best. We start with basic washing-up liquid, move on to a dedicated Silca bio-degreaser, and finally, unleash the nuclear option: an ultrasonic cleaner with a heavy-duty carb cleaner. The results are genuinely shocking! Find out

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