Cleaning the alloy engine casings on my 900A4 , I have done the cam cover with gunk then soap and water then a coating of Fertan H102 Aluminium Cleaner then Solvol Autosol and wire wool , them final polish with Solvol only.
Trouble is there are still blackish markings etch on the alloy, I am thinking Vapour Blast is the answer but any ideas would be welcome.
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Alloy casing cleaning
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