white limestone discoloration after cleaning, please help

[seb seb]

Hi Everyone, I really hope you can help!
My first job was to clean white limestone tiles. I cleaned it with high pressure machine but it looked like was not cleaned ( there were white spots and tiles looked discolored) than I have used Tile Doctor Remove product to remove the sealer and then I used Pro-Clean Tile, Stone and Grout Cleaner and NanoTech Ultra Clean penetrating Tile & Stone Clean but the limestone tiles still look discolored. Than I used scrubbing machine and still the same problem. I really need your advise what to do to get solid white color before I seal the tiles. I have attached the photo. Any advice highly appreciated!

Many thanks

 

[jay]

Hi there seems to be a lot of cracked tiles in pic is that the effect you want .and are tiles solid theres a bit of grout missing in places

 

[seb seb]

Hi Jey,

cracks were already there, tiles are solid, there was a bit missing grout but all is solid.

 

[diamondtiling]

Did you use a high pressure washer inside a property? You say this is your first job, is it your floor or a customers?

 

[seb seb]

I used floor scrubbing machine and portable 1200 with turbo hybrid spinner, yes I just started tiles cleaning business.

 

[Rich]

If all is solid, why are the tiles cracked and the grout coming away? Do you know what the substrate is? If there is grout missing and cracked tiles, the water may have gone through and damaged the substrate.

As for the stains, how long have the tiles been down? What has caused the staining? Limestone is very sensitive to acids, be very careful what cleaners you use on it as you may make it a lot worse.

 

[enduro]

I wont use a spinner on natural stone as they put to much water down.

 

[hillhead]

Something going on with this floor, stone is so easily stained as most of us know.

 

[enduro]

Something going on with this floor, stone is so easily stained as most of us know.

Could be staining from grey adhesive.

 

[jay]

might be dot and dab fixing

 

[seb seb]

thing is that before cleaning there was no signs of this stains, after cleaning they have appeared. I have used a mild alkaline-based cleaner which should not make discoloration. . Or do you thing that the stains were there but because were dirty the stains were not visible? those tiles are about ten years old.

 

[seb seb]

first photo is before

second is after cleaning

 

[DHTiling]

How long after cleaning did you take the pics..?

 

[enduro]

Did you do this floor today?

 

[enduro]

Beat me Dave...I think it is still drying from cleaning.