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One of my Cryptopay readers stopped reading cards. So I took a label/tag, shown in the picture, folded it, and moistened it with rubbing alcohol. After several passes through the reader, it works like a champ. Hopefully, I didn't damage it.
We also use credit card cleaners and we also do this roughly every 2 weeks at least. Same goes for our bill acceptors. We clean them regularly with bill cleaners. We use these to clean our Credit readers.