Rust stain on vinyl suding

[goaliedad]

Any ideas on how to remove rust stains from vinyl siding? High iron water from a sprinkler is causing it

Also on a white aluminum downspout

[crokett™]

Acids remove rust stains. I'd look at something like LimeAway or CLR. Muriatic acid works on removing rust stains in pools.

[Roly]

CLR says it should be diluted for vinyl siding and washed off within 2 minutes.   They say after 5 minutes it starts to etch the surface of the siding.   Roly

[oscarMadison]

Any ideas on how to remove rust stains from vinyl siding?  High iron water from a sprinkler is causing it

Also on a white aluminum downspout

odd, you should mention that.  I'm in the process of doing that now.  Over the years have fought trying to clean the siding and not had luck.  I found something that works great, Lime-o-sol by The Works.  Put on gloves, get a old washcloth.  Spray it on, wait for a minute, rub it out with the cloth, hose off the vinyl.  Works great, I was amazed, I've been fighting with this for awhile.  It works better as the cloth gets soaked.  On a few really bad spots I had to do it a couple of times.  

Now for the bad news, don't know about your area, but I can't find it around here anymore.  I had a little left, used it and ordered some on line, that stuff is hard to find.  It works so well, I'm willing to pay the price to have it shipped.

I tried limeAway, but it doesn't work well at all.  I did a test on two sections.  One with LimeAway.  Tried it, worked maybe a little, but 95% was still there.  Even let it sit for awhile, tried multiple times on the same section.  Sprayed a little LimeOSol and it took it right off.  Didn't see any problems with the vinyl sections where I used it.  Wear eye protection, that stuff started burning my hands when I wasn't wearing gloves.  I'd hate to see what it would do to your eyes.

the acids in LimeOSol and LimeAway are different.

[Snipe Hunter]

Out of curiosity, how to your plumbing fixtures look inside?

[goaliedad]

This is at a house I did some trim painting at. She said they have a filter for the house- no complaints there.
I talked to a guy that sells siding. He suggested Rust Off.
I will look for LimeOSol too

[Guest]

Oxalic acid ( wood bleach ) mixed in hot water, will do the job, faster than typing about it.

[Robert Adams]

Oxalic acid ( wood bleach ) mixed in hot water, will do the job, faster than typing about it.

Ditto. Works great on rust.

[oscarMadison]

Oxalic acid ( wood bleach ) mixed in hot water, will do the job, faster than typing about it.

limeosol in a spray bottle
Mixture
Chemical Name CAS No. Weight-%
oxalic acid 144-62-7 4 - 8*
glycollic acid 79-14-1 1 - 5*

[goaliedad]

I passed on the lime-o-sol suggestion. If I were doing it I would try oxialic acid, but for this person the ready to spray stuff sounds best. Thanks all