you don't need to clean the tip of the sensor to acheive a better contact as its an inductive sensor that doesn't touch anything! its not copper either its steel!
as previously mentioned the likely fix in your instance was unplugging & plugging back in the plug that restored the connection!
you can have the last word. i lay down my 25 years of relevant experience, years of college & countless manufacturers training courses when armchair mechanics 101 is clearly the definitive champion!
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