On Mon, 27 Oct 2014 16:03:35 -0500
"Paul K. Dickman" wrote:

snip
Its most common use is as a wood bleach.
If you check the deck cleaners for wooden decks it is pretty much Oxalic
acid.

Savogran sells 1lb tubs of granular for $6 at hardware stores.

Paul K. Dickman

Thanks for the sources. This gives us a few more possibilities...

And thanks to everyone else for their comments and input. I'll pass the
info along and save for my own personal use

--
Leon Fisk
Grand Rapids MI/Zone 5b
Remove no.spam for email