Cotton bud and methylated spirit.
BUT - use at your own risk!
Meths takes the tampo off a Scalextric crystal display case, a modern Scalextric car and Taurus NASCARs from the 90's in my experience. It takes quite a bit of gentle rubbing but it does come off after 3-4 minutes. It doesn't touch SCX cars at all - the clear coating seems to be resistant to meths.
I haven't tried it on any other makes.
BUT - use at your own risk!
Meths takes the tampo off a Scalextric crystal display case, a modern Scalextric car and Taurus NASCARs from the 90's in my experience. It takes quite a bit of gentle rubbing but it does come off after 3-4 minutes. It doesn't touch SCX cars at all - the clear coating seems to be resistant to meths.
I haven't tried it on any other makes.