Squeaky brakes

Any ideas why my 200 had developed squeaky (rear I think) brakes? Any good cleaning products (aside from the normal stuff)?

The noise is on and off - off more when they get temperature into them.

Someone at work reckons it's brake dust build up, but I haven't had a chance to put the pressure washer on them yet.
 
Thanks - I would need to invest in the jack and the axle stands though - and find somewhere level. My driveway is quite sloped!
 
Try getting the prssure washer around that area then as a quick fix. Usually does the trick for me.
 

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