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I tried a mild detergent/ water solution and a rag (wiped them off) and it made a slight difference. If they could be removed and washed I bet it would clean them well - can't get the covers off easily.
carefully blown air duster or compressed air followed by a swiffer pad?
...will not make them look new. The fabric will need to be cleaned with some sort of detergent, but even still, they have probably faded with time and will never look "new."