I know there is a section about cleaning, and I have my own ways with different problems.
Normally I would not take the time to clean but these are just so damned pity.
I have had the opportunity to buy the casino Kursaal de la Panne CLP jetons and the CLP plaques that were in a garage under layers of dust.
Some of the jetons are drilled, some are melting but three of the five plaques have marker on them.
Only one was in perfect condition.
So, anyone? These are old so plastic wasn’t so though as now.
I’m thinking acetone but am worried that the plastic will melt?

Thanks for the tips. I don't have magic marker in my house.

The better ones are on the chipguide. Image from the chipguide.

Jo from Belgium.