Oh - just remembered another tip - allot wheel cleaner often does a nice job of smartening up alloy castings - be aware that some of them can tarnish alloys if left for too long soaking. You probably won't get them looking like new but they will look loved with these cleaners.
(Others have tried oven cleaners - but - I can't stand the hacking coughing you get from using that poison - all very dodgy)
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