Selleys White For Life Grout Pre Mixed in a tub.
Its extremely hideous stuff.
The pack states that to clean it off tile surfaces after applying that you wash with water, ok seems reasonable.
Then after letting it dry for a few hours you rub off the "haze" as they call it with a rag.
The so called haze is like a latex rubber that will not rub off no mater how hard you try even though it had only been 12 hours since application.

The only method I found to work to get rid of the haze was with a scouring pad and brake cleaner.
Even after using this method of cleaning off the haze I had to keep going over the tiles and checking for patches I'd missed.

The cleaning off of the haze took longer than the laying of the actual tiles....Read more