Most of the stuff mentioned is petroleum based or has some petroleum in it. Could be hard on stickers or anything else not friendly to petroleum products, i.e. sealants.
For fiberglass, boat people have a pretty good selection.
I use McLube Hullkote. Citrus based and easy wipe on, wipe off. It is slick so be careful working around on top. Expensive but good and fast. I use spray bottle of water on surface to thin it out some. One bottle will do two applications on a slide in truck camper easily, maybe three.