Reply to "I've stopped using Simple Green on Fastrack"

There is no "one size fits all" solution to track cleaning because there are so many variables involved, including how often one cleans the track and how one cleans and lubricates the equipment that runs on those tracks.  Keep in mind that the "gunk" that accumulates doesn't just build up on the track; it also builds up on the wheels of locomotives and rolling stock.  Few O gauge modelers I know of really take the time and effort to clean wheels on a regular basis and take care not to over-lubricate their locomotives.