Well various people will tell you that the clicking and clacking comes from movement of the bearings in the frame cups but my experience is that it's caused by movement of the crankset axle in the inner races. I've cured mine by removing the LH crank, knocking out the RH crank and chainset, cleaning everything up and applying a smear of bearing fit compound to the machined tracks on the BB axle which fit inside the bearing races. For reassembly it's probably a good idea to smear the compound inside the LH bearing and outside the RH machined track on the axle so that you don't wipe the compound off the axle as you push the end through the RH bearing. Geddit?
Doing this has completely stopped the irritating clicky clacky noise from my BB30 that was driving me mad. In evidence that that axle actually moves and frets inside the bearing races, have a careful look at this pic I took and ask yourself where the scoring and erosion on the machined bands came from, bearing in mind that the BB axle is a forging of soft alloy fitted inside bearings of much harder steel.