@Annette853
From my experience, Airbnb will not charge a guest for additional fees unless the guest agrees to it. So, if the guest ignores or declines the request, I am not sure there is much you can do about it. I had a guest ignore a request for a fee she had agreed to, so I escaped it to Airbnb. She didn't respond to them either and they said there was nothing more they could do as they needed her permission.
Extra cleaning was added to Aircover, but it seems to only apply to 'deep cleaning' according to the only wording I could find in the Help centre about it. Not sure if your situation required 'deep cleaning'?