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Discuss Indian Sandstone Picture Framing/Grout marks in the Specialist Tile -Stone, Porcelain, Glass area at TilersForums. USA and UK Tiling Forum

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1sandyh

Please checkout the following advertisement.
Yeah I sent the guy photos emailed back & forth etc. He said the only product safe for stone is builders clean. He advised me how to use it etc. I used 4L bottles the weekend just on a smallish area it hasn’t touched the bloody stuff.

Grout was Instarmac ultrascape flowpoint in mushroom colour, (orange bag) I’ve contacted them too they advised me to contact a cleaning company!
 
OP
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Dumbo

I'm going to phone instamarc today and see if I can shed any light on this . It may not be a good answer though . But I wont accept contact a cleaning company .
 
OP
1

1sandyh

Thank you JCR! The woman I spoke with was J (not sure if I’m allowed to say full name on here?)
 
OP
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Dumbo

Right I have just had a reply from grout manufacturer's after talking to technical and their reply is this .
(The stains are left by incomplete rinsing of the surface and when the water evaporates it leaves the calcium salts.

Brick acid may be too strong for Indian sandstone. There are other acid based products that can be used. Lithofin Builders clean (acid based) need to seek advice from the stockists. Start of by diluting it 10/1 and incrementally increase the dosage if required,this should shift the stains. If you are unsure do a small test patch first in an indiscrete area.)
Sorry no silver bullets .
 
OP
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1sandyh

Cheers JCR. Same advice I had from Lithion. It didn’t work so was advised try 3-1 or 4-1. Used 4-1 left on for 20 mins, scrubbed and scrubbed like I’ve never scrubbed before! Rinsed. Next day looked at them dry. Nothing had changed. So went even stronger almost used it meat, left m, scrubbed constantly, rinsed. You guessed it didn’t budge. I used 4 L bottles on area of approx 20m2. Thanks for your help I’m literally at my wits end with this
 
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Dumbo

@Lithofin BOB I'm certainly no expert but is it worth the householder spreading builders clean and then sheeting down with plastic sheet to allow it to work for longer .
 
OP
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1sandyh

Thanks so much for helping out. Apologies for my terrible spelling in the last post. Should have said I used it almost NEAT, scrubbed, left for 20mins then scrubbed more. Really hoping someone can help me find a solution to this. Looking forward to Bobs opinion
 
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Waluigi

Try the paving expert forum. Not knocking anyone’s advise on here by any means, just saying that this sort of thing is very common on there.
 

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