How to remove stains from water ponding??

MHasterok

MHasterok

New member
I have several accounts that have poor drainage in certain areas, so there is heavy staining where the water pools up. The pic below is actually a very minor one. Anyone know how to remove these type of stains? My degreasers and hot water don't even touch them.
 

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Try some oxalic acid Mike. Start with 1 cup in very warm water (help dissolve the crystals) per gallon. Pump sprayer, dwell 5 minutes, rinse. Flush any vegetation and asphalt thoroughly. Works great for irrigation stains, rust and brightening concrete.

If you use this acid, please do not let it come in contact with oxidizers (bleach and ammonia to name a few common ones). You also don’t want it to come in contact with silver. Oh, and don’t drink it or breath very much of it. It’s toxic to your kidneys.

Hill Brothers has a location down in Tucson, 55lb bag should run about $60.00.

http://www.hillbrothers.com/tucson.htm
 
thats not mildew or it would have came up with pressure. It looks like stains from constantly being wet and was more than likely covered in mildew before you cleaned it but the stain is going to be extremely stubborn more than likely. Start with the oxalic and if that doesn't work give me a call I will have something for you to try on it
 
Chris Francis said:
does oxalic kill black mold or types mold on concret I have drive coming up that is covered with the mold.
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Lately on sidewalks that are covered in mildew I have been applying a roof mix ot stronger to it before we clean to speed up the cleaning. For the cost factor of it I can apply it and leave then have a tech go back with 40* tips in a surface cleaner and fly through it and collect a check later.
 

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Thanks for all the replies guys. It's not mold/mildew. I have let Hotsy Ripper 1 dwell on it, and used 15 degree tips with hot water at 3000psi, and it doesn't do anything. Have went over it with the surface cleaner several different visits also.

I'll try the oxalic and chlorine (not at the same time).
 
That concrete came out nice and bright Chris, great job.
 
Mike, those stains are impossible to get out. I think it is 'mineralization' in the cement and is in fact harder than concrete. Just for research you could get different acids and see what they do. I haven't seen them do anything but if I really wanted to get rid of it I would get kleenstone or glazed surface restorer from ecochem, apply and cover with plastic. Both of those have sodium bi-fluoride which is a safer? form of hydrofluoric acid. If the stain comes out it will take some cement with it and leave the area more porous and will restain faster.
 
tomtucson said:
Mike, those stains are impossible to get out. I think it is 'mineralization' in the cement and is in fact harder than concrete. Just for research you could get different acids and see what they do. I haven't seen them do anything but if I really wanted to get rid of it I would get kleenstone or glazed surface restorer from ecochem, apply and cover with plastic. Both of those have sodium bi-fluoride which is a safer? form of hydrofluoric acid. If the stain comes out it will take some cement with it and leave the area more porous and will restain faster.
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Thanks Tom. It's been nice and warm here at night in Tucson huh. I'm lovin the night temps right now!
 
tomtucson said:
Mike, those stains are impossible to get out. I think it is 'mineralization' in the cement and is in fact harder than concrete. Just for research you could get different acids and see what they do. I haven't seen them do anything but if I really wanted to get rid of it I would get kleenstone or glazed surface restorer from ecochem, apply and cover with plastic. Both of those have sodium bi-fluoride which is a safer? form of hydrofluoric acid. If the stain comes out it will take some cement with it and leave the area more porous and will restain faster.
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Tom is right. That's not a mildew and chlorine will not do anything. It is mineralization. I have met those and have tried a high concentrate of butyl degreaser (which I generaly use on concrete) but it doesn't do anything. May be oxalic acid would do something, but don't waste your chlorine or any degreaser on it. Call Mr. Rex with Pressure washer products. He knows everything in the PW world :)).
 
MHasterok said:
Thanks for all the replies guys. It's not mold/mildew. I have let Hotsy Ripper 1 dwell on it, and used 15 degree tips with hot water at 3000psi, and it doesn't do anything. Have went over it with the surface cleaner several different visits also.

I'll try the oxalic and chlorine (not at the same time).
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Trust me! :groucho: (famous last words...lol)

Wet it, sprinkle, Lt brushing, 2-3 min dwell, rinse...

http://www.summitbrands.com/brands/ironout.aspx

If that doesn't work try C-4
 
That iron out has probably worked better than anything else for me on rust, if it goes after those its another notch on its belt. Thats how I use it also - Moisten then apply powder, agitate.
 
tomtucson said:
That iron out has probably worked better than anything else for me on rust, if it goes after those its another notch on its belt. Thats how I use it also - Moisten then apply powder, agitate.
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I actually have some Super Iron Out, I'll see if that works.
 
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