Cleaned the Tiles - Grouts gone Funny!? Advice

[jparker86]

Hello people,
I have just brought a new house and it has some porcalin tiles with a rough surface / finish. They was filthy beyond belief, but suspect it was because the house was laid empty for almost 2 years and no one has bothered to clean them.
If I got on the floor and scrubbed them they did come up like new, but with the size of the area I felt it was best to get the help of some cleaning solution.
I had some Sodium Hydroxide solution in a bottle and used this on the tile and couldn't believe it- they come up like new. Only thing is the grout has gone a weird grey colour. Is this because the grout has come up like new also or has it damaged it?
If im honest I hate the floor but can't really be bothered to replace it so want to do my best to bring it up like new.
picture of the area cleaned:



Jason

 

[Mr T]

Looks like normal. Grey grout to me mate... What colour was it before was it just dark with filth?

 

[jparker86]

If you look at the bottom in the middle of the picture you can see the grout change colour. This is where the Sodium Hydroxide hasn't been. Can you see its a lot darker?

 

[Mr T]

Tiles look cracked tho so id get a new floor lol

 

[jparker86]

No they haven't cracked yet? Where can you see a crack?

 

[Alan.P]

Hard to tell, looks like a mid grey grout and the section you haven't cleaned is muck ? what happens if you try and scrape ( lightly ) at the darker area ?

 

[Mr T]

The one in the middle of the pic looks like its got 2 cracks running rite through the tile and the one next to it unless is just excess cleaning solution on the grain of the tile... Tbh it looks fine mate just give the rest of it a goof clean as long as the grouts supposed to be grey should be ok but im not a pro mate

 

[Mr T]

Sorry there not cracks lol

 

[jparker86]

This is the sorta thing that bothers me.
Its gone abit half and half here:

 

[big george]

looks like the adhesive showing thro not the grout