Track cleaning discussions abound on these forum threads. Adding more to the mix that's already here, author Bob Keller, in Lionel's Track and Power 2014-2015 booklet recommends cleaning track with citric based solutions. Lionel's advisory on page 46 states:
"We recommend using an all-purpose cleaner with a citric base cleaner because it does not degrade the metal rails nor does it cause poor electrical connectivity between the rails and the wheels of the train. Alcohol-based cleaners should be avoided since they tend to degrade the electrical connectivity of your trains."
Do you agree or disagree? What's been your personal experience?