You could try tinfoil Gary. Crumple some up then using water maybe with a little detegent rub away. It should remove rust without scratching the much harder chrome. When happy with finish you will need to protect with metal sealant.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone