Posted By:
Damian AndersonIf you "clean" them you will ruin their value as the cards will be considered altered. There have been several posts here of collectors soaking T206's in water to remove glue or remove from scrap books. If you were to attempt to soak in water to try to remove dirt I would use distilled water and get the advice from someone here has done this. I think if you used any other method other than just soaking in water the cards will be considered altered.
Damian
Can you post some pictures? Which HOFER's did you get?