Grout stuck in ceramic tiles

[Mitch]

I have just tiles two toilet blocks with 300x600 tile with lots of groves running though and left the mate to grout them as I went on holiday for a week.

I have come back to loads of grout stuck in all the groves and its proving a nightmare to get it out , tries high strength residue remover and white vinegar and a lot of elbow grease , this working but at a very slow rate.

Looking for a faster solution please.

 

[Tile seller]

Nightmare.
Depending on the tile of course, wire brush?

 

[Rookery]

Maybe a multi tool with an oscillating diamond blade.

 

[J K Tiling Cornwall]

Have used a nylon brush attachment that can be fitted in a drill, rapidly removes surface grout and pretty safe, just try to test on a spare tile first.

 

[Mitch]

Thanks for the replies , I used a product called sticky stuff remover...it seems to have done the trick with a lot of wasted time though.