Removal of Granfix Maxigrout from Porcelain tile - Tile Advice

[leighduffy]

Hi folks, I'm wondering if somebody could help me out...

I recently tiled my bathroom with black porcelain tiles and grouted with Granfix Maxigrout Charcoal. When applying the wet grout it was a darker colour such that distinction between grout and tile was very difficult.
I cleaned off excess grout from the tiles as best I could but unfortunately left thin coats in some patches, which is now evident as it has dried to a lighter charcoal.

My question is how is it best to remove this dried excess from the tiles? There is no guidance on Granfix's product data sheets - I wonder if somebody has had a similar problem with success?
Abrasive cleaning seems ineffective so wondered if there was a product available that would remove it without adverse effects?
I have seen 'lithofin' suggested in one other post, but note there are several products available; if this is the best solution, which product would deliver the best results?

Many Thanks in advance all,

Regards, Leigh

 

[Rookery]

Are these glazed or unglazed tiles?

 

[DHTiling]

Cement away is good for this type of issue..

As with all cleaning products , test in an inconspicuous area first.

 

[leighduffy]

Thanks for the reccomendation Dave, I'll give it a try.
Rookery, they look glazed to me - they have a slight gloss look to them with glass fragments within them for 'sparkle' so presume would be glazed to emphasize this.
Cheers both, Leigh