Yes, but it is very time consuming and you will be able to notice unless you clearcoat the whole thing when you are done. I use toothpicks, polishing compound, very fine grit sandpaper and a few chemical methods with varying degrees of success.
Here are some pics of one of my C628 shells that I renumbered using the toothpick/polishing compound letter removal method. You can't see it well but the areas are shiny where I removed them. I haven't clearcoated yet. I am not sure I am happy with it.