I'm glad a few of my sniper/DMR buddies aren't the only ones doing this. lol
If you're a sniper/DMR it's practically a must. The consistancy you get from washed bb's is great! You almost eliminate the random 'fliers' theat stray away from your groupings. It helps you hopup as well because the light layer of oil film left on the bb's during the manufacturing process doesn't get trasnfered to your bucking making your bucking more consistant and adjustments can be more precise and the adjustment shows up almost immediately rather than sometimes waiting a few shots for it to settle in.