Give this a read, it's a new thread posted regarding the info I put up a few months back regarding washing BBs. I basically asked if others could try it with their rifles and provide feedback to see if it's a common benefit or only for my sniper rifle set up (upgraded CA M24 and modded KJW M700). Seems right across the board improved results from washing.
http://www.airsoftretreat.com/forums...?topic=41711.0