Rust colored staining from Sprinkler system

[Oxfordlawn 14]

I just rememebred this and wanted to ask for some ideas...

ALL the houses here have automatic sprinkler systems and they run along the foundations with heads that pop up and spray outward in a 180 deg. sparay pattern. One of the houses I did today was vinyl sided and 2 of the heads must have been out of adjustment because there was an orange rust colored tint to the siding where the water would be hitting the house. the area was only on the lower row of siding and maybe 2 to 3 feet in length. I had a real tough time getting the stains off with the regular house soap/bleach mix I use, and even scrubbing with a vrush wasnt helping. I was able to get it lighter after a lot of work but it never totally went away. Any ideas on what I could have used to help get this stain/discoloration off with less work. I was wondering about mixing up some of that CLR stuff I have seen and used around the house in the past, but Im affraid to test it on someones house without asking for other ideas here first.

Thanks,

Tom

[Oxfordlawn 14]

after some more searching, I think I found my answer...White Ox Rust stain remover??? sound good? Easily purchased online as well.

[Danny Bates 14]

Oxalyic acid is what you need.

[John Orr 206]

If you only have an occasional need for it, Home Depot - and many hardware stores - carry Rust Aid. Costs about $10/gallon at HD and is oxalic acid.

[Rick2 42]

Go with the oxalyic acid.

[All Surface 24]

Either one will work but the Ox will be cheaper in the long run. Just be carefull on how you apply it to Concrete.

[Oxfordlawn 14]

Thank you, Thank you for the replies..so I guess Oxy acid is what I want huh??? LOL seems y'all agree

[soapwarehouse 14]

Tom, If you ever do any wood deck work you will find that most wood brighteners or neutralizers that you use after striping is most of the time just an oxalyic acid mix so you can use some of that as well.