How to clean wheel sensors

Hello

I think I might have dust/dirt on my wheels sensors. Every now and again my ASR off light turn on along with the cruise and abs light. I turn the engine off and on and it resets until the next time. I had it repaired a year or so ago and they said it was a dodgy sensor. How do I get to the sensors to do it myself?

Thanks

Edited 27 November, 201015 yr by tigermad