Hydrodipping is a method of applying paint, so both would end up with paint on the surface. I don't know for sure, but I would assume dipping the part would leave a thicker layer of paint than airbrushing.
You should be able to remove it with paint remover, wire wheel, sandpaper, blaster...
Some of that looks like a garden hose would take it off.
I think your pressure washer would do a number on it.