Removing Black Grout Stains?

[gooty]

After using black grout on my beige porcelain matt tiles, it's left stains that won't come off with water on a kitchen sponge scrubber.
Is there a correct way/product to do this?

 

[Qwerty]

Cement/ grout residue remover from LTP or Lithofin

 

[Lithofin BOB]

Use either of the above , pre wet the joints with water before you apply the diluted product to the tile, this will minimise the acid damaging the grout joint colour, always test one tile to determine the dilution of the product required ,work in small sections. Flash clean the tiles, 1-2 minutes - or test longer , bottles will often state to use for 10-12 minute, use a white pad or stiff brush ,rinse well after application time.

 

[gooty]

thanks guys, but ive just stumbled on an easy and cheap way to get rid of it.
Astonish oven cleaner from home bargains. Under £2. Dipped wet cloth in the tub and the back grout stain comes off really easy )))

 

[One Day]

The best, easiest and most cost effective way is this:

Don't use black grout.

ever.

 

[andytyler]

try diluted white vinegar 60p from tesco. or neat if you test it on the grout first. i had charcoal grout residue stuck in textured non slip porcelain. white vinegar, left it 10 minutes. scrub with scourer, clean residue off with wonderwipe.

 

[ogy]

i'm using black grout to match the tile..but the stain on the tile won't come out after scrubbing. i try out the vinegar tip but isnt working.please do advise?

 

[Old Mod]

Is that an unsealed terracotta tile?

 

[Old Mod]

That's one for you @NZ_Tiler you're only over the road!

 

[Pro Tiler Tools]

thanks guys, but ive just stumbled on an easy and cheap way to get rid of it.
Astonish oven cleaner from home bargains. Under £2. Dipped wet cloth in the tub and the back grout stain comes off really easy )))

Astonish is amazing stuff, we found that their high strength bathroom cleaner even removes the black mould from silicone.