Try cleaning with hot water and oxiclean or use 5x polishing powders and
scrub the grout line with a grout brush. The sulfuric acid will probably
etch the travertine depending upon how strong you mix it

John E Freitag
President/Owner
The Stone & Tile School
407-567-7652
407-615-0314
jfreitag@thestoneandtileschool.com

www.thestoneandtileschool.com

-----Original Message-----
From: list-manager@stoneandtilepros.simplelists.com
[mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Stephen
Webb
Sent: Thursday, September 11, 2014 1:29 AM
To: sccpartners@stoneandtilepros.simplelists.com
Subject: Re: Grout cleaning

Hi Mike, would sulfamic crystals (instead of oxalic) work the same with this
process?

On 7/31/2014 2:47 PM, Mike Marsoun wrote:
> I had some travertine with filthy grout and embedded into the pores dirt,
> NOTHING worked: strong alkaline with HOT water spinner, Klenztone with the
> spinner (and zero degree nozzle)  This is what I did and it worked
> beautifully. Sometimes you have to break a few eggs...  I made a mix with
> 10% hydrochloric acid and a tad of neutral cleaner to make it lay. Sprayed
> lightly over an area, then sprinkled generously oxalic acid crystals over
> the area and brushed it in with a coarse broom. There is a reaction and
the
> soils rise to the top like nothing I have ever seen.  Then extract with
the
> spinner and it is like new, 100% clean.  This is the MOST effective way to
> get travertine with embedded dirt clean. This was a honed finish surface I
> did and the sheen was restored with a couple quick passes with a grit
brush.
> If the finish is polished it will need to be polished with 5x. It won't
need
> any sanding.
>
> -----Original Message-----
> From: list-manager@stoneandtilepros.simplelists.com
> [mailto:list-manager@stoneandtilepros.simplelists.com] On Behalf Of Mitch
> Heitman
> Sent: Friday, 1 August 2014 2:43 AM
> To: sccpartners@stoneandtilepros.simplelists.com
> Subject: Grout cleaning
>
> Hi everyone,
> I was called to a job that the homeowner wants the grout cleaned on this
> stone. He installed the floor himself and has many different types of
stone
> through out it. We went to give him a sample and I mopped a 12ph alkaline
> cleaner on it and scrubbed the grout lines and let it dwell for ten
minutes.
> Then I used my 1200psi portable with spinner tool. It made no difference
> whatsoever. Usually on tile and grout we can use a strong acid and it
cleans
> the grout perfectly. However we all know that acid would destroy this
floor.
> Color seal isn't an option because the grout lines are all different sizes
> and the stone has a tumbled edge, so i think it wouldn't come out very
well.
> Has anyone come across this before? I also attached a picture of the
sealer
> he used on it because I believe the sealer is keeping us from getting the
> chemical into the grout deep enough to clean it? He also wants to go back
> with a color enhancer to brighten the floor. I have not used a color
> enhancer before since I usually clean regular ceramic tile. Is there
> anything I should know in order to put it down? Other than just putting it
> in a paint tray and applying it with a window cleaner?
>
> Thanks for the help
>
>
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