In would have fitted new brake pads not just had them cleaned , brake pads are so cheap it just does not seem worth the effort of removing the wheels without putting in new pads. Especially as there was brake imbalance which almost certainly means that the pads were wearing unevenly . The pads are less than £20 for most cars, fitting takes a few minutes , not worth changing them around in my opinion just put in new pads and have done with it.