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They market "ally bright" at boat shops got a fare margin on it though.
Go to a refrigeration supplier i.e. Kirbys, Refrigeration Equipment Supplies, Heatcraft, Actrol etc and ask for "Coil Cleaner" (same as Ally Bright) get the acidic stuff cheap as $8-10/lt water it down 1-25 or less alittle stornger for real dirty parts put it in a pump spray bottle. Wet the Alum. 1st spray on leave for a couple of minutes and hose off.