I just posted an article on making a flanger card - this helps spread the ballast as well as clean out rocks and debris from frogs and points.
http://www.largescalecentral.com/articles/149/flanger-card
It is easy to make - takes about 5 minutes. I just made my second one as I lost the first one.

I no longer ballast under the moving point portion of my switches and clean them out with a high pressure spray from the hose.