Contact ebay CS from here: eBay Customer Service
I suggest you do it early tomorrow morning after 8am when you will probably get the Dublin call centre,
Explain what has happened, specifically that they have washed it so the item is no longer in the same condition as it was received.
CS may give the buyer a courtesy refund where you keep the funds, or they may refund the postage. Or they may not do anything. Whatever it will be worth a shot.
Add the buyer to your blocked list here: Blocked Bidders
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