Good Lord what did you use to clean it!!?? It looks brand new!!! :bowdown:
LOL, that's funny. You'll be pleased to know the vast majority of it occurred with the tip of a flat blade screwdriver. Finished up with an oily rag wipe.
Doesn't take much to make it 'reappear'.
Problem is it's hard to do with the hub in place.
I'm going to have to look up this sensor and read more about it.
I think it a magnetic type sensor, with the pull pulsing an ON/OFF switch with the undulations of the axle sensor ring. If so, heavy debris like mine could really affect things.
Here's another pic of both the pre-cleaned sensor and the old axle. Besides the obvious boot issue (it had been clicking over a year), note the flatness of both the bottom of the sensor and the sensor ring on the axle. The axle ring is also full of crap between the solids. It could be this is more significant than the stuff around the sensor since the sensor tip tends to remain close to the axle ring. If so, a cleaning of the ring may be more important and can be done without removing the hub. Much simpler.
The amount of rust also bothered me until I realized most of it is on friction-free parts. But, it shows why a lathering of grease in these places is good.
btw, all of these photos were taken on 2007-11-11. I changed the batteries in the camera and failed to notice it requires resetting the date.