I'll have to do a search on the Forum for "tried and true" methods of cleaning the external surfaces of grimy, vintage rolling stock, as the Lionel set that my brother-in-law kindly gave to me from his youth needs some love. In this regard, an article in the December, 2017 issue of CTT suggests the following method:
"To remove heavier grime and smudges from external surfaces, spray them lightly with furniture polish and wipe dry with a clean, soft cloth."
I've not seen this method used before. Has anyone successfully tried using spray furniture polish for this purpose? And, sorry if I failed the Forum "SEARCH" test and this topic has been discussed previously.