MWS, who supplied your Morgan's wheels, used to offer a wire wheel cleaning kit which worked well, although now discontinued. They still offer individual cleaning aids here though via their online shop. Probably the most useful is the cleaning and protection fluid below.

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Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone