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Posted By: barrysloate

Sean- paper conservators can clean cards, paper, photographs, etc. for a price, but that price often exceeds the value of the card. It's best to use their services only for something rare and valuable.

Edited to add not that a T202 Cobb isn't valuable, but it could set you back $100-150 and it's possible that they will only lighten the stain and not get it out entirely. Plus, they must use some bleaching agent, which even when diluted is not recommended for baseball cards.