Does anyone use or recommend materials like Armor All or similar products on train parts that typically are used to restore auto plastic and rubber? Specifically, the old 2032 Alco I inherited is of course black with yellow decals and stripes. I'd bet that would look nice after being wiped down with one of these products. It's kind of dull but maybe I should leave well enough alone.
My main concern is damaging the ancient decals and stripes on the engine so like the doctor's say I want to "do no harm".