The diffs better not be getting dirty. Its very important to do everything you can to clean them. Check out my kit Matt just bought. day 1 diffs. And I have pounded those suckers. I wont say its a must to clean the CVD's that's why I didn't post it at first. Just adding it in to show how dang oily and gritty they are. The cleaning is mostly so the glue will hold the drive pin ring on. I have had them slip off and I am sure its due to not cleaning them. Our track is very kind to CVD's from no dust on the track, And makes for no maintenance that's why I put a spot of grease in there.
I have found that if your anal about maintenance a pipe cleaner works pretty good to dust them out with a shot of motor spray. Then just add some oil. Its easier than pulling them and doing it.

Some one posted that you diffs will last longer if you loosen them after each use. I agree 100% on that. But I set mine and leave them. Seems how I have good luck with my diffs as is.

Diff note:
I used to put all my diff shims on the gear side in the point one. I was skeptical about the 3/6 on the .2 and I have seen other people post that on the .1. After doing it on the .2 I am sold on it. 3/6. Its better. After a couple of packs its as free as the 0/6.

Okay I am done gabbing. On everyone's next build or rebuild some of this will help. Its good practice for every kit but doe's take more time. It doe's pay off in the long run.