Hi Bruk
brake fluid works but its slow, media blasting is nice but not often available
I have used 'super clean' foaming tough task cleaner degreaser in purple spray bottle from auto parts stores
it works good at removing the pad printed lettering without removing all paint at least on some chineese Bachmann cars I did
If the factory graphics are not too heavily applied you could prime it lightly and topcoat from there
Good luck and be patient
Dave
