We use Landa L-209 Aluminum Brightener (Uses a blend of ammonium bifluoride and sulfuric acid) and neutralizer with a Landa Hot water pressure washer
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Wish I had acees to a steam cleaner like that. Bet the results are great
It works good but without the acid it does not work as well.
Likewise, the acid without the hot water does not work as well.
It is the combination of the two that is dynamite.
I would never have believed it and spent the money on it if a friend of mine who is in the business demonstrated it to me.