Well, I had a black Boxster S some years ago. After the extended part of the B broke off (typical), I removed the lettering. Yet, after 2-3 polishing and buffing sessions, I could still see the shadow of the script. The fact is, you can't bring the weathered and micro-scratched exposed paint to the same condition as the paint that had been protected by the lettering for a number of years. To say nothing of the chemical impact of the glue.

Anyway, we're getting seriously off-topic here.