is this because of a problem youve encountered? i doubt cleaning it will sort it, becides, it should never get dirty, as the pickup for this is on the flywheel, outside of the engine, unless youve got a big oil leak, the sensors on top of the box, but its abit more naughty than the smaller engines, they fail for fun these things, causing bad starting, and sometimes poor running too, the same crank sensor is on nearly all petrol renaults sinse shep were a pup, but the connectors did change, if it needs changing, the choice of two connectors will come with the new unit.