Best way to remove writing scratched in plastic

Hi! I've purchased piles of clamshells from recyclers which have "ABC School District" or similar text etched/scratched/etc. into the plastic on the top of the case. I need to remove this before re-selling the machines because recyclers are required to remove the previous identities of the machines they take in. Does anyone know a good way to do this kind of thing without making a total mess? The text itself is scratched into the plastic and pretty low-profile as-is, however I know it will look horrible if I take my Dremel to it. Anyway, just wondering if anyone has creative ideas.

Thanks!