If you're going to use Simple Green to clean your tracks you're going to have to follow up with a clean damp rag to get the soap film off the track. Of course after the damp rag you'll probably want to go over it with an alcohol wipe to dry the track so just use IPA to start with and save the extra steps. The soap film is what's attracting the dirt and over a few days time it will set up like a thin film of glue. We used to use it at work to clean wax and grease off of lenses but we ran into the same issues. Simple Green does not evaporate away like alcohol does.
Jerry
