[p1w1]

Presuming the staining is a mixture of rust, hard water and algae, what method and chemicals would you use for the job please smudger?

I'll post you my reccomendations shortly - but I'm interested to see NK's solution to the problem...

Darran

Give him time to Google 

[nathankaye]

Presuming the staining is a mixture of rust, hard water and algae, what method and chemicals would you use for the job please smudger?

I'll post you my reccomendations shortly - but I'm interested to see NK's solution to the problem...

Darran

Is this gonna be another "whos d!@k is bigger type thread again!?" 

[Smudger]

not really,

im interested in your actual experience of working on this type surface and staining, what are the relevant questions to ask, and how/what your cleaning it with?

im as always happy to offer a solution based on the many jobs we have actually cleaned like this - without the need for the render to be painted (which may NOT be an option)

Darran

[Smudger]

Presuming the staining is a mixture of rust, hard water and algae, what method and chemicals would you use for the job please smudger?

I'll post you my reccomendations shortly - but I'm interested to see NK's solution to the problem...

Darran

Is this gonna be another "whos d!@k is bigger type thread again!?"

no, you need a magnifying glass to see mine

Darran

[nathankaye]

Thats algae and mold etc whereas the other is rust etc which will need treating/cleaning but it looks deeper than surface damage so prob still need a lick of paint.
But that looks a great job

No just a different application - have you done a lot rust removal from render??

(Repost)

[John Mart]

Presuming the staining is a mixture of rust, hard water and algae, what method and chemicals would you use for the job please smudger?

I'll post you my reccomendations shortly - but I'm interested to see NK's solution to the problem...

Darran

Don’t be mean.

[Smudger]

It's an overflow pipe that has been leaking down the wall. The problem is now sorted but the management company have asked the best way to remove the stain on the wall. Ideas?
Cheers...

We sell a brilliant product called PSRP Rust Remover.  I would try that first followed by PSRP Xtreme afterwards

As above, however that looks like it has eaten into the paint work, so even after cleaning I would imagine it will need a fresh lick of paint.

(repost)
who said that render was painted ?

Darran

[Smudger]

Presuming the staining is a mixture of rust, hard water and algae, what method and chemicals would you use for the job please smudger?

I'll post you my reccomendations shortly - but I'm interested to see NK's solution to the problem...

Darran

Don’t be mean.

not being mean - but (and no disrespect) this isn't window cleaning or moving mortar stains off glass with hot water - the wrong advice will cause damage worse than a bit of staining

However if there are those that know better and have experience of this type of work im happy for them to give out a cleaning method suitable for this problem

Darran

[chris turner]

Presuming the staining is a mixture of rust, hard water and algae, what method and chemicals would you use for the job please smudger?

I'll post you my reccomendations shortly - but I'm interested to see NK's solution to the problem...

Darran

Don’t be mean.

not being mean - but (and no disrespect) this isn't window cleaning or moving mortar stains off glass with hot water - the wrong advice will cause damage worse than a bit of staining

However if there are those that know better and have experience of this type of work im happy for them to give out a cleaning method suitable for this problem

Darran

I would prefer your advice please smudger

[nathankaye]

Thats algae and mold etc whereas the other is rust etc which will need treating/cleaning but it looks deeper than surface damage so prob still need a lick of paint.
But that looks a great job

No just a different application - have you done a lot rust removal from render??

Not from render so speculating on the paint.  Slabs n drives, yes

Sorry i reposted the wrong post 😂

Yep this aint cleaning windows and as a matter of fact, i wont change my stance on cleaning concrete splatter off windows with hot water dispite what tepid/warm water users and cold water users think.

My post is not contradicting ur thoughts smudger, just an observational difference of the picture u decided to post to shiw some excellent cleaning. However rust staining b4 n after picture would have probably been better in this case.
Also i answered your question when u tried to call my bluff on my karcher pressure washing skills 😂😂 (obviously a joke on karcher b4 anybody picks that up n runs with it), as i said not done any on render (rust removal) but i have on slabs n drives and so, yes inwas speculating on the render given the picture that was posted.

[Smudger]

ok - so from the limited info from the picture I will - in this instance assume its k-rend or another stained/coloured render and not painted

firstly we would steam clean the area - this would be low pressure but 150 degrees
and see what's left -treat the rust areas with oxalic acid - use semi stiff broom/brush to agitate - leave for 20 mins
steam clean - this will remove all organic staining and I would (educated) guess remove 90 to 95% of rust stain without damaging the render - repeat for any residue staining

we would work off a small cherry picker/spider lift

IF its a painted render you can do the above but the risk of paint flake if high depending on age and condition, however getting a match and painting the area would be easier than with coloured k-rend/etc

you could try the above with cold but would take longer/more attempts - but the oxalic acid MUST be mixed and applied with hot water

Darran

[Kev Martin]

I havnt seen it in person yet so I can only presume what the staining else like anyone else. I would agree it looks like a water mixed with rust stain from the pipe.
I'm due to do the gutters and windows their next week and they asked if I could jet wash the stain as well. I told them I'm pretty sure jet washing wouldn't remove it but I would try to find something that can.

Kev Martin would you mind posting a link to these products. Thanks

The products are all on our website www.tilinglogistics.co.uk and incidentally our rust remover is not acidic.  It is pH Neutral so requires no hot water to apply or remove.