I don't think a semi will give the same results
As my exhaust is nowt special, I just use fine wire wool and WD-40, which its looking "good-ish". If you want better:"Belgom Alu is a liquid cream for polishing alloy, chrome, brass, etc. It is supplied in bottles containing 250mls. Belgom Alu is less abrasive than most other polishes and will not, therefore, remove detail from castings or damage paintwork adjacent to polished areas. White aluminium oxide deposits or other corrosion are dissolved chemically by Belgom Alu - this is far more effective and more gentle than using abrasives. Once the oxidation is dissolved the polish rapidly shines the metal surfaces. At the same time as polishing, Belgom Alu is also laying down a protective wax layer which will prevent moisture or salt spray reaching the metal surface for a considerable time. It is found that in regular winter use a bike may be ridden uncleaned for six weeks or so after polishing with Belgom Alu without metal surfaces corroding."http://www.elitecarcare.co.uk/product_info.php?cPath=24&products_id=110
Solvol Autosol and a strip of cloth about 2" x 9". Use in a sawing action with plenty elbow grease, especially on the lips Cass
Do Halfords sell wire wool?