Plastic scraper or very carefully with a razor/safety blade.
isopropyl usually doesn't wipe lettering unless it was a cheap ink which I've seen for stuff like expiration date stamps. If you're unsure, just lightly dampen with water instead.
So, I tried asking this question on Reddit, and all I got back were trolls and unserious replies.
After you scrape it off, replace it with a knockoff R4 sticker lol