Thanks for ordering the Rail-zip Richard, very interested to try it. I’m no chemist but I am a member of the Institute of Road Transport Engineers so I have had an interest in lubricants. I would be surprised if Rail-Zip is simply ATF because that has lots of additives, some of them not very nice. Lighter fluid is naphtha transportable in some types of plastic bottles so problably ok on commercially produced rail chairs etc., not sure about 3D printed ones and in its purest form I wouldn't expect it to leave a useful residue. It may also contain benzene which is not good in contact with your skin. You prompted me to look in the garage for my can of Super Servisol, the stuff I’ve used for years to clean, lubricate and protect electrical contacts on boats. My tin is so old it doesn’t have any safety warnings; the current version is Servisol 10 and according to the safety sheet it’s not so good for the fish and it’s main hazard is butane propellant, should be ok on most plastics. Perhaps we can do a comparative test, cleaned with alcohol no lubricant, cleaned with alcohol and Rail-ziped, cleaned with Servisol and left.