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Uncle Marvo · 07-08-2007, 12:04 PM posted to uk.rec.gardening

In reply to Martin ) who wrote this in
, I, Marvo, say :

On Mon, 06 Aug 2007 18:02:24 +0100, Sacha
wrote:

On 6/8/07 17:58, in article
, "Martin"
wrote:

On Mon, 06 Aug 2007 17:42:47 +0100, Sacha
wrote:

On 6/8/07 14:44, in article ,
"Barb" wrote:

Hi, I've got some horrendous rust stains on flagstones, from old
cast iron pation furniture.

What's the best way of cleaning these? Can it be done? I've
tried all sorts of the usual things and nothing really seems to
work ...

Thanks.

I've forwarded this to Cormaic to see if he has any ideas and/or
time to tell us!

There is a chemical that will remove rust stains, people use it on
GRP boats. Oxalic acid. It is toxic,

Do you know how far it will penetrate, Martin, if these stains have
gone deeply into the flags? I think Barb has to be careful what she
does according to what kind of stone these are made from.

No. I have never used it. I avoid nasty chemicals.
Proprietary rust stain removers often contain oxalic acid.
Some toilet cleaners contain oxalic acid.

Rhubard leaves contain oxalic acid. You could try those :-)

Acetic acid is just as effective (vinegar). I imagine borax would do the
trick too, but will take long.