Tired water damaged grout

[robbieraven]

Just been on a grout clean-up job and failed horribly. Bathroom is about 9 years old so wasn't expecting too much, they are slate effect porcelain on an Impey deck, not sure what the grout is. I'm under the impression this is beyond clean-up, just wanted to check what you guys thought. I used some Grout deep clean but it didn't make any impression on it at all! I suspect it's not really dirt but more limescale.

Thoughts

Cheers

 

[Dumbo]

@Lithofin BOB

 

[Qwerty]

That looks wet/ mouldy!? Tiles on the wall look saturated

 

[robbieraven]

That looks wet/ mouldy!? Tiles on the wall look saturated

I had just cleaned it so it would look a bit wet, but it was all bone dry

 

[One Day]

Clean it, dry it, and saturate the grout with a colour enhancing sealer.
It will look great (for a while)

 

[Lithofin BOB]

Hi , If you have degreased the area with an alkaline cleaner that is perfect to start, it will leave you with generally calcium / salt based residues.
As you said limescale, I would be carefully with a strong scale remove ,
Use ( test) a specific ceramic tile scale remover, we have ceramic clean
Test at 1-1 or as stated
Pre wet the joints first
Apply and scrubb with a stiff brush and white pad
Rinse and re apply if required
Watch you grout colour , you do not want to burn this white