an old idea but new type of install. i have been using a track cleaning car with masonite slider for many years.
below is a link to the sample of the article and you can download the free pdf magazine.
the author uses a center line track cleaner in front of the slider boxcar.
http://model-railroad-hobbyist.com/mrh2009-Q3/track_cleaning_car
click on mrh issue3, july 2009 to download the complete magazine.
lex
nice tip... gonna try it