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How to remove grout from slate crazy paving?

Hi all,

I am in the process of renovating my pool area. I recently removed an old deck which was covering an even older castlemaine slate path. I have removed all the old grout and glued down all the slate that had lifted up. I am now in the process of regrouting.

Unfortunately I rushed on the weekend and didn't clean as I went which has resulted in a big mess. The slate has a lot of grout haze and bits of grout all over them.

Is there a product and method I can use to remove all the haze and grout on top of my slate without damaging the slate and the grout in the joints?

I was thinking about using a grout haze acid type product and a petrol powered high pressure cleaner.

Any tips would be greatly appreciated.

Photos below.

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Decking and Paving

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Cleaning

Comments

Jewelleryrescue

Hi @DIYJT11

I just finished cleaning a expensive stone wall i got cement splashed on even though it was covered for the most part.

Simple solution a round drill wire bush (not the cup shaped ones the flat ones with the steel bristles sticking outwards like spokes on a wheel)

Do not use gold colored wheels unless you have no choice as they can color the stone black use one with steel bristles they work a treat.

Wear googles wires will fly out.

You can even use a sander with 150Gt paper it will quickly remove grout,

Both methods will abraid stone a little but you have control over that by how much pressure you use.

No acid required and it may damage good grout as it is a floor and soak in.

Hope this helps.

DIYJT11

https://www.workshop.bunnings.com.au/discussion/comment/32036#Comment_32036

Thank you @Jewelleryrescue, I will give the a shot!

Jewelleryrescue

https://www.workshop.bunnings.com.au/discussion/comment/78436#Comment_78436

Hi @DIYJT11

Even the gold colored wire brushes will remove cement and grout just be mindfull if it leaves colored marks on slate and skim tiles more lightly the closer the state comes to the wheel.

This process will create dust consider having some one with spare goggles hold a workshop /old vacuum to collect wheels dust close to the grind.

EricL

https://www.workshop.bunnings.com.au/discussion/comment/103407#Comment_103407

Hello @DIYJT11

Welcome to the Bunnings Workshop community. It's marvellous to have you join us, and thanks for sharing your question about removing grout.

That's a great suggestion from @Jewelleryrescue. I recommend having a look at the Ryobi 6-Piece Wire Wheel Brush Set to grind the grout off. Using a mechanical stripper is much better than a chemical one as it might stain the slate. This also gives you complete control on how far the wire wheel goes. I suggest testing a small corner first to get the hang of it.

Please remember to wear personal protection such as appropriate clothing, gloves goggles and a mask when working on your project.

I also suggest having a second person holding on to the shop vac hose while you are grinding the grout. This should help reduce the amount of dust that will be generated. I also propose covering the pool to prevent the dust from landing in the water.

If you need further assistance, please let us know.

Eric

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