`because some of the backing tape residue has remained, even though I've explained how to get it off easily and without damage. `
I`ve had this issue on a few things i`ve bought beit new or secondhand items and the best method i`ve found to get it off, is lighter fluid in those yellow cans you can buy for a quid in pondland. It`s good enough at getting any residue off, but not strong enough to cause any damage to anything 🙂
In this case, the buyer is probably aware of what they can do, even after your advice, but the issue is just an excuse to get some money back, that`s al it is.
I`d tell them if they aren`t happy, to return it for a refund.
