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PostPosted: Mon Oct 16, 2017 10:26 am 
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Last week when barrowing concrete to the back of the house to make a slab, unfortunately some of the mix ended up on the block paving :(

I did try hosing it down, and I initially thought I'd cleaned it off. However when it the paving dried, it soon became clear that I hadn't. There's no lumps just plenty of white staining.

Here the advice is to use vinegar https://www.hunker.com/13414844/how-to- ... rete-spill

Is this so? or should is there other methods which are more effective?

Anyone care to comment on how best to tackle this?

Thanks :)


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PostPosted: Mon Oct 16, 2017 10:59 am 
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Have a go with some brick acid. It is a bit hard to get now since idiots have been using it in criminal attacks on folk. Worse comes to worse you can ease up the affected blocks and turn them over.

Did the concrete go off okay?

DWD

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PostPosted: Sun Oct 29, 2017 9:27 am 
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dewaltdisney wrote:
Have a go with some brick acid. It is a bit hard to get now since idiots have been using it in criminal attacks on folk. Worse comes to worse you can ease up the affected blocks and turn them over.

Did the concrete go off okay?

DWD


Thanks, I bought some off eBay although it does contain the necessary hydrochloric acid I'm not entirely sure to what percentage. With regards to the slab, yes it has fully cured but the top is dusty and crumbly...because idiot here didn't allow the bleed water to soak back in before floating it!!! :sad:


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