Car sold – “Flicks on the paint”

Hello together, I have a question and hope you can help me. I have sold our third car. Has been a white Skoda Citigo. This was standing quite long and often and probably under a tree. I have advertised the car and sold it. The buyer has examined the car and inspected everything, very carefully. Now he reports and sent me pictures I would have allegedly concealed something to him.. that’s not so Now he demands repair in which he prepares this to a car. I am really not aware of anyone’s fault and have given everything a scratch and a dent that I noticed. Can I sit back, do I need to repair? According to the buyer, he had washed the car 3 times.. I can’t understand. Thanks and greetings.