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Topic Review (Newest First)
09-17-2012 08:00 AM
deadbodyman Actually Ospho worked the best on rust stained concret...I just tried it and the bowl cleaner on my driveway...I poured a little ospho and toilet cleaner and waited about two minutes (about the time it took to find a brush) I couldnt find a brush so I used a toilet brush,gave them both a quick scrub and to my surprize they BOTH worked but the ospho worked twice as well.. I know a little about Ospho I use it all the time on rust so I know it removes rust it also converts it thats where the black stuff comes in it only turns black if you wet it and leave it doing nothing to remove the rust.
So the trick is NOT to let the ospho dry ,Pour it on let it sit a minute then scub a little and hose it off,simple and cheap too, ospho only costs about 15.00 a Qt....The toilet cleaner also works just not as well,just be sure to rinse them off well...now I'm going to go clean the rust stains out of my fiber glass shower...metal working is a blast but it will leave rust spots on the shower floor and I just remodeled my bathroom so the shower is new and full of rust..
I knew something would get it out but nobody knew what ,Now we know ...I can take pics if you want to see the results...
09-12-2012 10:21 AM
302 Z28
Quote:
Originally Posted by Old Fool View Post
hydrochloric acid, it may etch the concrete

http://www.instructables.com/files/o...F8GN4CZIND.pdf
Yikes, no kidding 15-25% Hydrochloric acid

Vince
09-12-2012 07:55 AM
Old Fool
Quote:
Originally Posted by nofearengineer View Post
Hey, I was just on a gardening website (no teasing ) and someone had said they had great results using "The Works" bathroom cleaner on concrete rust stains.



Only a couple bucks, so it's worth a try.


hydrochloric acid, it may etch the concrete

http://www.instructables.com/files/o...F8GN4CZIND.pdf
09-11-2012 02:32 PM
nofearengineer Hey, I was just on a gardening website (no teasing ) and someone had said they had great results using "The Works" bathroom cleaner on concrete rust stains.



Only a couple bucks, so it's worth a try.
09-11-2012 11:31 AM
Gringo
Stains

Seems you have tried all my ideas. I would call fert. comp. and see what they say,
09-11-2012 09:45 AM
John long Be careful that the Ospho does not eat the concrete. I know RustMort will and I believe they are ismilar products.

John L
09-10-2012 05:39 PM
LATECH
Quote:
Originally Posted by 302 Z28 View Post
Just a thought: On the suggestion of using Ospho. What happens when you use Ospho on rust? It turns black, so now instead of rust stains you have black stains.

Vince
Good point Vince. Not sure. It doesnt leave a black stain on the boat,but that is fiberglass not concrete.
09-10-2012 04:18 PM
302 Z28 Just a thought: On the suggestion of using Ospho. What happens when you use Ospho on rust? It turns black, so now instead of rust stains you have black stains.

Vince
09-10-2012 08:36 AM
302 Z28 It has been my experience after spreading fertilizer and getting rust spots on the sidewalk that they will fade and disappear after awhile from the sun.

Vince
09-10-2012 08:13 AM
67Mustang Al. Here is another one to try. When i sold my small yacht it had white nylon sails with rust spots in them from being wrapped up with wet steel fittings. The guy at the slip yard sold me a small jar of "OXALIC ACID". The rust spots came out to my amazement after leaving this stuff for about 5 minutes on the sail and then scrubbing with a hard brush.
Maybe be totally different on a drive but you never know.
Al.
09-10-2012 01:31 AM
dinger I had the same problem. Use toilet bowl cleaner, the kind that squirts upward in the toilet. The Works was good stuff, wife got it at the 99 cent store. Spray it on the spots, when it quits foaming, rinse with the hose. Might take 2-3 times, depending on how bad the stain is.
09-09-2012 08:04 PM
rockable Try Muriatic Acid. If that doesn't get it, you probably aren't going to get them off.
09-09-2012 07:11 PM
nofearengineer
Quote:
Originally Posted by 68NovaSS View Post
Molasses....sounds a little weird, maybe something we don't know about it...
I have seen where old timers would soak car parts in molasses to remove rust. I'm not sure if it would do the same on concrete, but it's cheap and worth a try...if you don't mind ants.
09-09-2012 12:13 PM
68NovaSS Yeah Vince, I tried some bleach, didnt' let it sit too long, but didn't phase it. Molasses....sounds a little weird, maybe something we don't know about it...

I might try the boat cleaner, but I did find a review of some stuff called Super Iron Out from a gal in Killeen, TX, near me, had the same Scotts product stain hers, said CLR did nothing, so I'm off later to get some super stuff and give it a try. I have some stains in the garage as well, so maybe this isn't too far off topic for the HRB...

Thanks guys
09-09-2012 07:22 AM
LATECH Boat guys use ospho to reduce or clean up stains in fiberglass that occur from the stainless pieces that rust. It has to soak for a bit. It is phosphoric acid. It might work...dunno.
CLR may have phosphouric acid in it, I dont know.It supposed to clean up rust stains too.Just a thought.
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