Alcohol can and will damage some plastics like celluloid. I have had Goo Gone damage some materials. Some of the "safe" orange cleaners can in fact melt some plastics or damage finishes.
In 20 years of pen work however, I have never had lighter fluid, which is naphtha, damage a pen.... at all, ever. Yes, I do still have some pens on which it was used 20 years ago. It works, and is used by many other pen repairers as well.
Baby oil is mineral oil, and quite thick. The advantage to naphtha is that it is very light, and evaporates very quickly.
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