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Old 14-04-2019, 19:19   #31
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Re: Oxalic acid

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Originally Posted by stormalong View Post
Home yard & garden fertilizer is not the problem.

Farm runoff from millions of acres of farms is. So is animal waste from huge feedlots.
Farm runoff is a large problem, but don't discount the lawns. There are more acres of fertilized, irrigated lawn in the US than the top 8 farm crops grown, combined. Four times as much as corn. Literally, residential lawn is the largest "crop". https://scienceline.org/2011/07/lawn...ntinental-u-s/

I've seen eutrophication of lakes many miles from any farm runoff watershed.
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Old 29-04-2019, 08:59   #32
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Re: Oxalic acid

I use a slurry of “Bar Keeps Friend” and the rust stains disappear in a few minutes. Then spray Citric Acid on the stainless. The citric acid is supposed to “passivate” any remaining iron so it won’t rust again.
I use the solutions available for descaling coffee makers. Good luck
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Old 29-04-2019, 14:44   #33
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Re: Oxalic acid

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I use a slurry of “Bar Keeps Friend” and the rust stains disappear in a few minutes. Then spray Citric Acid on the stainless. The citric acid is supposed to “passivate” any remaining iron so it won’t rust again.
I use the solutions available for descaling coffee makers. Good luck
Bar keeper’s friend is a favorite of ours as well.
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Old 29-04-2019, 17:43   #34
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Re: Oxalic acid

I used to use BarKeeper's Friend on my old boat on the Delaware River, north of Philadelphia. The hull staining above the waterline was really bad each year from the river water.

Some years ago I switched to Spray 9 Bottom Cleaner. It's a gel and seems to stay put better and not run. Our present boat summers in Maine and the hull staining is not too bad but still needs to be cleaned every other year. The Spray 9 is easy to apply with a chip brush. If the staining is bad I mist it a bit to keep the cleaner active, then I remove most of it with a plastic squeegee and rinse with a hose. Seems to eliminate streaking on the boot stripe and bottom paint.

Or maybe I'm just lucky.

Cheers!

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Old 29-04-2019, 22:50   #35
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Re: Oxalic acid

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Originally Posted by Group9 View Post
Bar keeper’s friend is a favorite of ours as well.
Bar keepers friend is just an expensive way to buy oxalic acid. I buy large bags on Amazon.
I just used it on sall that had been left in a bag for years with a rusty old shackle and had huge rust stains, came out completely after several applications, took about a week to do.
I have been reminding teak outdoor tables. Does a great job of lightening and stain removal.
Add tablesppon to pint of cold water, heat and stir until absorbed. Do not reheat, fumes are toxic. Best to wear gloves.
Rinse very well before finishing.

Amazon item
OXALIC ACID 99.6% 10 Lb. Deck, Crystals, Metal Cleaning- Rust Removal, Wood Stain Remover and More! https://www.amazon.com/dp/B0147IFKBY..._bd-XCbXGQSE9W
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Old 30-04-2019, 01:17   #36
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Re: Oxalic acid

I use oxalic acid as a cleaner. Works really well. I buy a 1kg tub of crystals and dilute at approx 10:1, water:acid. Then add wallpaper paste to make it into a gel. Paint on and leave for a few minutes, but try not to let dry before hosing it off. You won't be;ieve the difference.
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