Is that for sure laytex? Can you just peel it off?

You can remove it with alcohol and a good rag or sponge. You will have to work at it some but it will come off.

The original decals on that lower apron are delicate. You could try soaking the Apron in hot to warm water, or running hot water across it. Not sure if this will work, but anything stronger than water will remove the original decals. Any scrubbing will remove the original decals.

You may have to resort to this: http://www.pinballrescue.net/Decals_Apron_Gottlieb.html

The paint on the apron is very thin and fairly delicate.

You can try baking the apron in the sun on a warm day. You might be able to then just peel the latex paint off. But--it might also take some of the original paint along with it. But, it might be safer to do this rather than using solvents and rubbing.

For a last ditch effort. you could try "cheap" oven cleaner. Try a spot, watch it carefully, it might start to bubble the top layer. Then wipe it off and rinse with water.

"Also not even sure if this will work,, not even sure if it will damage the factory surface".

Oh, I misidentified the apron as Gottlieb. Hard to tell with the original artwork covered up.

Take the apron to a shop sink, get some chemical resistant gloves, or take it outside (to kill some grass), keep a hose handy, when spraying on the oven cleaner, try a small area. I have used cheap oven cleaner to remove enamel paint from plastic, and have been very successful with it. What I'm not sure is what is going to happen to the original paint and decals? The original paint on the apron might of been baked on. Where as on your apron hopefully that white paint was just sprayed on, with out any surface preparation.

Have you tried using a Heat Gun? One problem with using a Heat Gun is that the original paint surface can get scorched, fairly easily.

Take a rag or sponge and soak it in alcohol and rub the paint with it, if it starts to come off it is a latex paint, if not it is some other.

I used gasoline on a rag to get paint off my cabinet. worked great

Graffiti removers (such as Motsenbockers) also do remove original paint, so it's not the best approach, especially on an apron with delicate paint. Alcohol would be a better choice if you really had to use something, but I'd try to avoid chemical solvents in this case.