natural slate stone patio laid , grout haze marks on stone

[Mart the landscaper]

It doesn’t look like grout haze to me.
Is there a salt formation on the surface, does it cone off onto your fingers when you rub it. ?

Hi tested today it does not rub off onto fingers it seems to be in the stone from covering over

 

[Dave]

Hi tested today it does not rub off onto fingers it seems to be in the stone from covering over

You need to strip the sealer , leave to fully dry abd seal again. Then don’t let it get wet for 72hrs.

 

[Mart the landscaper]

You need to strip the sealer , leave to fully dry abd seal again. Then don’t let it get wet for 72hrs.

How can i strip it we hace tried numerous suggestions nothing is doing it. I tried as advised on here acetone. I tried thinners . I tried ecoprotec. I tried LTP solvex. I tried vinegar. I tried cif. I have tried nylon brush on drill like advised. Spoke to many people suggesting all the above what do you recommend to remove it. Looks like moisture has come out of the grout made contact with the covering PVC sheet and and run down into the natural Indian stone it is not slate and nothing seems to be shifting it

 

[Dave]

How can i strip it we hace tried numerous suggestions nothing is doing it. I tried as advised on here acetone. I tried thinners . I tried ecoprotec. I tried LTP solvex. I tried vinegar. I tried cif. I have tried nylon brush on drill like advised. Spoke to many people suggesting all the above what do you recommend to remove it. Looks like moisture has come out of the grout made contact with the covering PVC sheet and and run down into the natural Indian stone it is not slate and nothing seems to be shifting it

@Lithofin BOB any ideas mate.

 

[Mart the landscaper]

@Lithofin BOB any ideas mate.

Also if you scratch your finger nail on it seems to spread in the stone yet leave a small white/grey flour/dust type texture on your finger take sa lot of work to scratch at it on a little cm spot and just spreads further more than anything seems on the stone if i cant come up with some ideas im gonna have to rip the patio up and relay the whole lot costing around 5 grand any posts welcome please as i have not received that many comments on it im open to ideas as its just awful all over the patio. I think 1 lesson learnt next time i will just grout a small area at a time as i got it all done in a day and have always used this and never had a problem its deffinately down to covering it up like the manufacturer suggests if unexpected weather change. I spoke to the manufacturer they said you did the right thing covering it up and now this. If i knew a company who could come in and sort it i would pay them to remove it if i knew they could succeed. On the day i checked all weather reports was fine and 6 hours after i finished a sudden change in the wether with no sign of it til then so i had.no choice but to protect grout and joints very frustrated any help and expertise greatly appreciated