Help: Grout left on too long!!

[Unregistered]

I've recently put some tumbled travertine tiles on the kitchen wall but the grout dried quicker than I thought it would.
Is there any way of getting it off. Most of it is just dust and I keep wiping it with water but it just doesn't shift.
There are also some edges that have thicker bits of grout on them. It just doesn't want to shift please help. Thanks.

 

[m3fitter]

sounds like you didn't seal it properly prior to, if the tile still stays 'dusty looking '

 

[Unregistered]

sounds like you didn't seal it properly prior to, if the tile still stays 'dusty looking '

I put the intensifier on that they sold me. I put it on twice before grouting thinking that would be enough. If it wasn't sealed
Properly is there anything that can be done to get rid of the dusty look?

 

[m3fitter]

intensifier isn't sealer, intensifier is applied prior to sealing...

 

[Chalker]

You could try one of these, then re seal and polish.
http://www.protilertools.co.uk/removing-tile-grout/682/rubi-replacement-emulsifying-pad-set-20902