I don't know if they can be cleaned, the connection on the inner guard can be (early model only) 
 
But if you wanted to try, then i would only recommend doing it with electrical contact cleaner and i would only spray it on and let it dry naturally, i wouldn't touch the sensor at all.
 
Mine seem to be OK once i had new pads and rotors and the faults cleared, i'm due for new pads again and last weekend i had the ABS/TC lights come on, luckly i reset with the key fixed it, but i will be doing the pads to be on the safe side.
 
Baz.
				
			 
			
		 
			
				
			
			
				Cheers Baz.
2011 Discovery 4 SE 2.7L
1990 Perentie FFR EX Aust Army
1967 Series IIa 109 (Farm Truck)
2007 BMW R1200GS
1979 BMW R80/7
1983 BMW R100TIC Ex ACT Police
 1994 Yamaha XT225 Serow
			
			
		 
	
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