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Oxalic acid source Cheap!

I lived on my wifes sailboat at a marina, that had showers. The plastic shower stall would get iron stains form the well water. I found out that by spraying on oxalic acid, mixed with hot water, the stains disapeared as you sprayed.
I tried it on metal, and had good results.

Here's the best part. I found a swimming pool supply co. where I bought 50#'s of oxalic acid for $55. Other folks at the marina split the purchase.
That was when 1# at the store was about $6-$7.
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