@ChecklistChikorita asks
there are strange specks on old cards from a damp box. Do I wipe them off?
Jeff answers
I'd keep the affected items separate and avoid brushing or treating them at the sorting table. Get an experienced assessment of the material and the safest next step. Don't mix them into clean storage while you're unsure. Some rescues need more than a new sleeve.
— Jeff, infinitepulls.com