(OK, track is squeaky clean? Let's move on. The wheels, on your locomotive, may be dirty and need to be cleaned. There are several ways to accomplish this: some easy - some not so easy. The easiest way is to use a Kadee "Speedi Wheel Cleaner". This is an electrically charged wire brush that allows the wheels to turn as it removes any accumulated 'gunk'.) Quote
This is a VERY BAD IDEA with DCC. The Kadee brush can cause shorts and blow the system or the decoder. When Cleaning wheels on DCC Locos the safest way is to used good old fashioned lighter fluid on a papaer towel. Put the fluid on the paper towel. next put the towel on the track , just run the loco across the towel a couple of times and it will clean the wheels.
Peter