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  1. #1
    Join Date
    Aug 2005
    Location
    Cranbourne West
    Age
    72
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    0

    Default Cleaning concrete

    I've got some rust and tannin stains in the concrete apron in front of my garage and was wondering if hydrochloric acid is the right product to do the job.

    Attachment 114296 Attachment 114297
    To grow old is inevitable.... To grow up is optional

    Confidence, the feeling you have before you fully understand the situation.

    What could possibly go wrong.

  2. #2
    Join Date
    Nov 2007
    Location
    belgrave
    Age
    61
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    0

    Default

    Someone at Bunnings should know!
    anne-maria.
    T
    ea Lady

    (White with none)
    Follow my little workshop/gallery on facebook. things of clay and wood.

  3. #3
    Join Date
    Aug 2008
    Location
    Port Kennedy, Perth
    Age
    53
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    0

    Default

    Should work give it a go.
    David
    giveitagoturning @hotmail.com

  4. #4
    Join Date
    Apr 2006
    Location
    near Mackay
    Age
    60
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    0

    Default

    When I'm using Hydrocloric acid to clean concrete, I dilute it 5:1 with water.

    Maybe do the spots first, to try and remove the worst of it, then do the whole area to get an even look.

  5. #5
    Join Date
    Nov 2006
    Location
    Bendigo Victoria
    Age
    80
    Posts
    4,565

    Default

    I have successfully removed rust stains from concrete using Oxalic Acid.

  6. #6
    Join Date
    Jul 2008
    Location
    Mandurah WA
    Age
    63
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    0

    Default

    Hey there,

    Wasn't there a post about flattening sharpening stones, someone said that it cleaned their concrete, get a few mates to come over and give the driveway a bit of a scruffin'

    Otherwise the diluted Hydro acid, and yes I'd do the spots first, then make sure that you rinse it really well or you will be getting little white fluffy bits popping up for ages.

    HazzaB
    It's Hard to Kick Goals, When the Ba^$%##ds Keep moving the Goal Posts.


    Check out my Website www.harrybutlerdesigns.com.au

  7. #7
    Join Date
    Aug 2009
    Location
    Melbourne
    Posts
    1

    Default

    Hey, perhaps this might help. There are a bunch of instructions and documentation re. concrete surface preparation. Perhaps something related to cleaning concrete as well?

    Cheers.

    http://www.polishedconcretemelbourne...e-preparation/

  8. #8
    Join Date
    Aug 2005
    Location
    Cranbourne West
    Age
    72
    Posts
    0

    Default

    Thanks everyone for their input. I mixed up a batch of oxalic acid today at the recommended rate (250g/ltr water) and applied it with a stiff brush after using a pressure washer to remove excess grime. It didn't do too bad a job, got rid of the rust stain and most of the tannin stain. I might give it a go with hydrochloric acid in a week or so. One thing I found out is that although my pressure washer works on tank water with gravity feed it is nowhere near as powerful as when used with mains pressure. I may have to invest in a cheap pump if I'm going to use the pressure washer on a regular basis.

    Before:

    Attachment 114511 Attachment 114512

    After:

    Attachment 114510 Attachment 114509
    To grow old is inevitable.... To grow up is optional

    Confidence, the feeling you have before you fully understand the situation.

    What could possibly go wrong.

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