I have an older set of Centennial balls, I have been using Meguiars Car wash solution for a good while, works fine. No complaints. Use a Magic eraser to remove the embedded chalk marks. Try it for yourself.
Sir,
I may have what you are looking for. I have a real nice Instroke 3 x 7 manufactured in Germany.
I have been use it for storage only for about 5 years. Let me if your interested. CNMC.
By no means am I trying to show any disrespect to the Grffis family or the AZ Billiards community,
but "Rocket" Roger is longer with us. R. I. P. One fine player he was. CNMC.