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Zerotol. At the hard surface rate, this will clean off moss and algae.
 
I tested a retail (Bonide) liquid iron(5%) and minerals supplement (8 oz per gallon) on some full-cover moss in our shady flower garden. I compared it with untreated and with Quicksilver, (after 12 hours no results from the Quicksilver).

The iron (on the right) at 24 hours turned the moss black. More results later.

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